splash-in.ogg (cc0), splash-out.ogg (cc0), bubble 1.ogg(cc0), and bubble 2.ogg(cc0) - https://opengameart.org/content/40-cc0-water-splash-slime-sfx
empty.ogg (cc0) from - https://commons.wikimedia.org/wiki/File:Short_Silent,_Empty_Audio.ogg
water_step.0.ogg from minetest game default sounds
