A hurricane warning goes up and you’ve got maybe 24 hours before the storm makes landfall. The stores are picked clean, water pressure is about to become a memory, and you’re staring at your bathtub wondering why you didn’t think ahead. The WaterBOB is exactly what fills that gap – literally.
What It Does
The WaterBOB is a heavy-duty, BPA-free plastic bladder that fits inside a standard bathtub and holds up to 100 gallons of tap water. Setup is straightforward: lay the liner flat in your tub, attach the included fill sock to the faucet, and let it fill. The whole process takes 20–30 minutes. Once full, a included hand-operated siphon pump lets you draw water out into pitchers, jugs, or whatever container you’re working with. The liner seals to keep the water clean and protected from airborne contaminants – no open-top tub situation where dust, debris, or curious hands get into your supply.
It’s rated for one-time use and designed to store water for up to four weeks. The liner material is thick enough that it won’t puncture under normal conditions, and the fill sock creates a sealed connection to the faucet so you’re filling clean from the start.
Why It Belongs in Your Kit
Down here on the Gulf Coast, water is the thing that gets people every single time. You can have three weeks of food stockpiled and a generator running, but if the municipal water system goes down or gets contaminated after a storm surge, none of that matters. FEMA recommends one gallon per person per day – a family of four blows through that fast. A WaterBOB gives you a 100-gallon buffer with almost zero setup time, as long as you deploy it before pressure drops.
That last part is key, and it’s where most people get it right or wrong. This thing works when you fill it from a functioning tap – ideally 12 to 24 hours before a storm hits, or the moment a boil-water advisory goes out and pressure is still good. I keep one of these sealed in its original packaging under the bathroom sink, ready to deploy the moment a tropical system gets within a few days of landfall. It costs less than a case of bottled water and takes up almost no storage space when unused.
Beyond hurricanes, the WaterBOB makes sense any time water supply is uncertain: extended power outages that knock out well pumps, winter storms in areas with pipe-freeze risk, or rural areas where contamination events can affect the local supply. It’s not glamorous prepping – it’s just smart use of a resource (your bathtub) you already have.
Honest Limitations
One-time use is the big one. Once you’ve filled and used a WaterBOB, it’s done. You can buy multi-packs, but factor that into your planning – this isn’t reusable gear.
It also takes your bathtub out of commission for the duration. If you have a single-bathroom home and need that tub for bathing, showering, or anything else, you’re giving that up. In a real disaster situation this is usually a reasonable trade, but it’s worth thinking through ahead of time.
And again – timing matters. If you wait until the power is already out and water pressure has dropped, you’ve missed your window. The WaterBOB only works when you have a functioning tap to fill it from. It’s not a filter or a purification system; it’s storage for water that’s already clean when it goes in.
How It Stacks Up
The main alternative most people consider is stocking up on bottled water – cases of gallon jugs or cases of 16oz bottles. For pure drinking water storage, bottled water requires no setup and is portable, but the cost per gallon is dramatically higher, the plastic waste is real, and 100 gallons of bottled water takes up significant floor space. The WaterBOB, stored flat, takes up almost none. Aquatank II is a comparable bladder-style product that comes in larger capacities (up to 150 gallons) if you’ve got a larger tub or need more volume – it’s worth a look if you’re outfitting a bigger household.
For longer-term water storage beyond a single event, stackable water barrels or IBC totes are a better investment – they’re reusable, durable, and can be refilled and treated repeatedly. But those require dedicated space and more setup. The WaterBOB’s value is in being cheap, compact, and deployable in under 30 minutes when a storm alert hits. Different tools for different situations.
Who Should Buy This
If you live anywhere with hurricane, tropical storm, or flood risk – this is a no-brainer purchase. Same goes for anyone on well water who loses supply during power outages, or anyone with a single bathroom and limited bottled water storage space. At the price point, there’s very little reason not to have one in reserve.
If you’re already set up with large dedicated water storage – 50-gallon barrels, a cistern, a whole-house filtration system – the WaterBOB probably doesn’t add much. And if you’re looking for something reusable or portable, this isn’t it. It’s a one-time-use, fixed-location solution, and it’s good at exactly that.
Common Questions
How long can water stay stored in a WaterBOB?
The manufacturer says up to four weeks. After that, you’d want to treat the water or replace it. If you’re storing it longer-term, adding water preservation tablets (like those from Aquatabs or Potable Aqua) can extend that window and keep the water safe to drink.
Does it fit all bathtubs?
It’s designed for standard residential bathtubs. It works in most 5-foot and larger tubs. Very small or unusually shaped tubs may not accommodate it fully – worth checking your tub dimensions against the product specs if you have a non-standard setup.
Is the siphon pump easy to use?
Yes, the hand pump is simple – you insert the tube into the spout on the bladder and pump manually into a pitcher or jug. It’s not fast, but it works reliably and requires no electricity. Expect to spend a few minutes filling a gallon container.
Can you use it with well water or non-municipal sources?
You can fill it with whatever comes out of your tap, but the WaterBOB itself doesn’t filter or purify. If your well water has quality concerns, treat it before or after filling. It’s designed for potable tap water storage, not as a filtration system.
Bottom Line
The WaterBOB is one of the cheapest and most space-efficient ways to bank 100 gallons of clean water before a storm or outage hits. Check current price on Amazon – at what it costs, buying one before you need it is an easy call. Just don’t wait until the storm is 12 hours out to order it.
Some links on this page are Amazon affiliate links. I only recommend gear I personally own – if you buy through my link, I may earn a small commission at no extra cost to you.
