That's right! Emissive textures for xali's Potions! I have gone in and made emissive textures for each potion that I felt needed them.
Requires xali's Potions and Optifine/CIT Resewn
If you're textures are glitched, make sure you are also using xali's Potions! This will not work without it.
Download here - https://www.curseforge.com/minecraft/texture-packs/xalis-potions