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Bottled Water, Boiling, Tablets or a Filter: What Actually Works When the Tap Stops?
The short answer: no single method does everything. Stored water runs out, boiling needs fuel, tablets need time, and a filter doesn't stop viruses. The setup that covers the most ground for the least money is a filter for every person plus a pack of tablets. Here is why.
The four options, side by side
| Stored bottled water | Boiling | Purification tablets | Stormward filter | |
|---|---|---|---|---|
| Needs power or fuel | No | Yes | No | No |
| Space for 3 days, family of 4 | 12 gallons, about 100 lb | Pot, fuel, working stove | A small pack | Fits in a drawer |
| Works on murky water | Not applicable | Kills germs, sediment stays | Works poorly; sediment stays | Yes, removes sediment |
| Bacteria and protozoa | Safe as bottled | Yes | Yes, some need up to hours of wait for Cryptosporidium | Removes 99.99% |
| Viruses | Safe as bottled | Yes | Yes | No |
| Wait before drinking | None | Boil, then cool | 30 minutes to several hours | None |
| Taste | Normal | Flat | Chemical taste | Carbon stage reduces chlorine taste |
| Runs out | After the last bottle | With the fuel | After the last tablet | After up to 130 gallons per filter |
Tablet wait times vary by product and water temperature; follow the label. Storage math: 1 gallon per person per day (Ready.gov).
Stored water: good for day one, gone by day three
Every home should have some. But three days for four people is about 100 pounds of water, and most homes don't have the room. It also stays behind if you have to leave.
Boiling: works, if the stove does
Boiling kills bacteria, protozoa and viruses. It needs a working stove, fuel and time, and in a blackout many homes have an electric stove that doesn't work. It also leaves sediment in the water.
Tablets: the best virus protection, with a wait
Purification tablets are cheap, small and handle viruses, which a filter does not. The trade-offs: a wait before drinking that can stretch to hours for some parasites, a chemical taste kids often refuse, and poor results on cloudy water.
See the filter that pairs with them →A filter: instant, reusable, no power
The Stormward Grid-Down Water Filter removes 99.99% of bacteria and protozoa, plus sediment and microplastics, as you drink. Its carbon stage reduces chlorine taste. No wait, no power, no chemicals. One filter handles up to 130 gallons, about six months for one adult, and weighs 3.5 oz.
It does not remove viruses, dissolved chemicals, heavy metals or salt. That's the gap tablets fill.
What we'd actually put in a family kit
- One Stormward filter per person, plus one for the car
- A pack of purification tablets for virus risk
- Whatever bottled water you have room for, for day one
That covers bacteria, protozoa, sediment and viruses, works without power, and fits in a kitchen drawer and a glovebox.
Every Stormward order has a 60-day money-back guarantee. Bundles include free filters at checkout, plus a free Grid-Down Water Protocol e-book and 16 emergency prep checklists.
Build my family's water kit →Filter performance figures are the manufacturer's; the independent lab report will be published on our Lab Report page. Not medical advice; follow local public health guidance during a boil-water notice.
Get up to 4 filters free today
- Removes 99.99% of bacteria and protozoa
- No power, no batteries, no chemicals
- Up to 130 gallons per filter, 3.5 oz
- Free e-book and 16 prep checklists
- 60-day money-back guarantee
60-day money-back guarantee · Secure checkout · Free guides by email