Toxic water is a bit hard to get purposefully. The best source of drinking water is toxic water bottles, which are most easily found in water coolers and in the white file cabinets in the Sacramento Suburbs delta 9 elevator room (upstairs). Fountain pens are also a decent source, as while they don't give much they are common and also have a chance to give precious ore. Dye is a decent source if you salvage a lot of food in your backpack, but is unpredictable to get.
|3 + 1||Toxic water bottle|
Research projects - random values
Toxic water bottle - open water tank and click this resource when you have at least 5 water of this type.