Water in a Crisis: Forum User Prices Purifier Tablets at €25

Clean Water: From Jugs to Purifier Tablets

Does water expire? Some say no. One forum user claims to have been drinking from stored jugs for over twenty years, simply rotating them. This sparks a discussion among those who distrust public supply: if the taps run dry tomorrow, how long will my stored water last, and how can I replenish it?

The short answer is inconvenient. Supermarket labels suggest a two-year best-before date. Domestic practice differs. And the real issue isn't expiry: it's quantity.

How Long Bottled Water Really Lasts

Manufacturers state two years. Stored in a cool, dark place, without being moved, it lasts much longer. What spoils stored water isn't time, but light and heat, which encourage algae and microorganisms. Hence the recommendation circulating in the thread to use opaque, hermetically sealed HDPE or PEAD rigid containers instead of flexible supermarket jugs, which degrade and release microplastics. Homemade tests with glass bottles show source water lasting two years without issues; the next test aims for three.

The Three Contaminants and Why Boiling Isn't Enough

Water becomes contaminated in three ways: dissolved solids, chemicals, and microbes. Solids can be removed by settling, letting it rest and discarding sediment, or using flocculants like aluminum sulfate. Chemicals, measured in parts per million, rarely make well water undrinkable unless consumed continuously. The third factor is decisive. And here, numbers matter, according to a biologist's video cited by a forum user: sodium dichloroisocyanurate achieves 100% disinfection, boiling reaches 98%, and UV lamps hit 85%.

From the Municipal Tank to the €25 Tablet

The method that, according to one user, wins this ranking is dichloro 55, which they claim official organizations use in emergencies. They state a bottle of 300 tablets costs around €25 and each one purifies 200 liters, requires no electricity, takes up minimal space, and loses only about 1% of potency annually after the third year. In contrast, classic alternatives: pressure cooker boiling uses almost 100% of the energy and can be used for cooking, but requires fuel; a distiller consumes 750 watts per hour; a UV bulb can break at the worst moment. The old recipe of homemade lye with wood ash is still shared, though with less enthusiasm than a packet of tablets.

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The Question No One Wants to Answer: The Thirsty

The analysis breaks down here. Having water is half the problem; the other half are neighbors who don't. Facing a prolonged outage, one perspective argues, the scenario becomes unsustainable within days: millions searching for water, looted stores, a month without power. Microplastics become a luxury of abundance. Others argue the solution is community-based: neighbors with mountain or travel filters setting up a collection and filtering point. Neither stance is definitive. No one knows which will prevail.

If this holds true, buying a bottle of tablets and a couple of opaque containers will become as commonplace as owning a box of candles. With a caveat: no one has yet tested the system in a real-world grid collapse scenario. Only in homemade tests.