In the nightly builds Acid rain and drizzle have the capability to destroy items in outside tiles, items in this case also including you. This renders funneling useless because the containers get destroyed.
However collecting that acid is essential for acid-based crafting products, so this is what you do:
Set up a funnel inside a vehicle, preferably your designated kitchen RV.
Drop a steel jerrycan or preferred large container on the tile with the funnel trap.
???
Profit! (and or batteries)
Sleeping near an active funnel usually turns the funnel-collected water into acid, so one neat trick is to park your DKRV near a pool (watch out for them swimmers), so that the RV kitchen unit is less than 3 tiles away from the water, position yourself inbetween of these two crafting components and enjoy your clean water (fresh) (hot).
