What Water Merchant means
Water Merchant is one of six officially named starting paths. The official Steam description says water must be tested and filtered before it becomes a safe product line.
Profit comes with liability
Every product line is described as having its own profit curve and consequences. For water, the named consequence is liability. That makes quality control part of the trade rather than an optional side task.
No filtration recipe, machine input, margin or optimal price is published here because those details are not established by the official source reviewed for this guide.
Connections to the wider shop
Probably Stolen includes machines, production chains, inventory management and customer demand. Water trading sits inside that wider economy, so a good current-build decision needs to consider both product preparation and the cash reserved for rent.
Playtest note
Machine behavior and economy values can move during the Playtest. Use dated, reproducible evidence before adopting a claimed water setup.