Use a straw to blow into a glass of water or use an effervescent tablet (like Alka-Seltzer).
To "prepare a piece" for , you are likely looking to record or "fill" an ASMR roleplay script . In the ASMR community, "M4A" (Male for All) indicates a script or audio intended for a male speaker and a listener of any gender. 01 Magic Potion m4a
If you are also filming a video component, you can create realistic "potions" using simple DIY methods: Use a straw to blow into a glass