After my Dupes emptied a source of water (with some parts contaminated water), they are still able to pick bottled Water out of this source. Again and again and again. Its infinite. Hovering with my mouse gives me: 7,5 kg, 7,5kg, 7,5 kg, 6,4 kg, 6,4 kg, 6,3 kg, 6,4 kg and 6,4 kg contaminated Water. It doesn't change. My dupes continue to pull normal Water out of this liquid. One Kilo at a time.
I add my savegame that you can confirm this. (Beware it's a dying colony... the last 5 cycles I was just sitting there and watching after my colony was already in a disastrous state.)
CAVE: If you use this save to confirm this bug: disable the Water Pump immediate. I discovered by testing if my safe is working another bug... It'll be in a separate post.
Edit: It's not enough to disable the Water Pump (it takes to much time). Deconstructing a pipe will do the trick.
Edit 2: It's not working out of a save (I just thougt at the first moment)... I'm sorry... But the Bug worked for 5 Cycles...
Crate a source of clean water. Add contaminated water (e.g. let a dupe vommit out of stress in your water). Let your dupes use this water source. After your normal water is empty, dupes will coninue using this water source infinite.