While there are numerous bodies of water in Blue Prince, only one actually has Still Water. In fact, Still Water is the term used for “distilled water.” It just so happens that there’s a distillery in the Trading Post, which randomly appears as an option among the outer rooms.

To access the hidden nook, you need to use the Burning Glass or Self-Ignited Torch to light the dynamite in the Trading Post. The wall will blow up, revealing a distillery.

Note: You can do the above part during a different/earlier run. The destruction of the wall will remain permanent whenever you draft the Trading Post in the future.

In any case, when you’re ready, go retrieve the Watering Can from the Coat Check. Then, draft green rooms in the manor so you can empty its contents–i.e. press the button prompt while inside a green room.

Next, head to the Trading Post outside and go to the distillery. You should see a prompt to refill the Watering Can. Congratulations! You now have Still Water in Blue Prince.

Note: If you don’t think you have enough steps remaining for the next tasks, you can store the Watering Can–which now contains Still Water–in the Coat Check. The Still Water works even when you retrieve the item on a different day.