Once a potion fluid is put in any fluid container except a glass bottle, the potion name and strength is not shown. Unless you've memorized all potions by their colors, you need to take a sample to find out which potion it was.

Other mods like IE already did something for their potion fluids where the potion effect and strength are appended in the fluid name. Could you do something similar?

https://github.com/BluSunrize/ImmersiveEngineering/blob/1.11.2/src/main/java/blusunrize/immersiveengineering/common/util/IEFluid.java

Nuh-uh. Just because the feature request no longer bothers you personally, doesn't mean it's not a valid feature request.

As I said back in February, Charset sees little to no maintenance - but the issues serve as a bug/feature request record for any potential future maintainers who might want to pick up the project, as well as any contributors passing by.

On second thought, I'll create custom fluid dye and fluid potions which I'll brew with another mod's barrel, and handle the filling/emptying using methods such as the ender io tank.