I hope this is this mod but I bet it's going be a conflict and annoying to find lol.

So when I right click the Sink with a empty bottle I end up getting an uncraftable potion.

Happens both MP and SP using the Pack "The Next Leap"

I sadly just tried the mod on its own so it does seem to be another mod conflicting with it. Will attempt to find out what mod.

I'm getting this as well.

I didn't always.
Some notable mods I've added recently include

• Thaumcraft
• Railcraft
• Forestry
• Tinker's Construct
• sadly many others.

My pack is loosely based on RLCraft. Vanilla RLCraft + CFB doesn't appear to yield this bug, but something I've added in my pack contributes.

@blay09 I see that this was closed. What was the fix?

It was closed due to inactivity. No idea if it's fixed itself or what mod is causing the problem.