Request, drop a pill into fizz water and recorde the disslove. I recorded the whole process: open the pill, open the bottle, drop the pill several times, fill the glas with pop-water, drop the pill and waiting for dissolve.
Tapping large water bottles (metal) against a leg to hear them make melodic sounds. You can hear the slosh of the water inside and the resonant tone. Noise reduction and amplification were applied to this sound using reaper.
Stainless steel "swell" water bottle half filled with water and shaken around. Various sounds of the liquid sloshing inside the bottle. Sounds like water inside a metal canteen.