Water

Regrettably, water is still necessary when you are Beneath. Water stored in barrels will not evaporate when you are Beneath. However, there is also the option of crafting a Juicer.

The juicer is a drinking vessel that allows the compression of Mushrooms into water. The single-slot user interface automatically processes inserted mushrooms into water.

Mushrooms spawn freely around the place Beneath the overworld. Fresh fruits may also be squeezed into water, if you have them handy.