The water chain, end to end

Water is the one product every counter on the station needs, which is why the trade is described as a ladder rather than a recipe. The bottom of the ladder is whatever the tap gives you: rustwater, cheap because nobody wants it. The top is a bottle clean enough that a buyer with a scanner will pay for it twice.

Community walkthroughs treat the first week as a machine-uptime problem rather than a sales problem. The purifier is the bottleneck: it needs an input that is already filtered and a cell with enough charge to run, and it is happiest doing that work overnight while the shutters are down. A shop that opens with a purifier mid-cycle has nothing to sell that morning.

The middle of the chain is where most of the quality comes from. Filter passes and a UV stage strip what the purifier cannot, and the difference shows up in the reading rather than in the taste: a stock unit was patched to reach 99.01% instead of a flat 99.00%, which is the kind of number a buyer will ask about.

Bottling is the step that turns a machine output into stock on the shelf. It is also where the trade’s failure mode is decided, because what is in the bottle is the shop’s claim about it. Relabelled stock sells for more than it is worth right up until somebody tests it.

The economics are unglamorous and that is the point. Each pass costs power and time; each sale returns a margin that survives a bad week. The trade will not make a shop rich in three days, and it will not lose the run in three days either.