First batch mixed..do you steep with a lid on or lid off the bottle...Mine seem to stay good indefinitely. I have some liquids that have been in the bottle for 6 months or more and are fine. Never had one go off.
edit: I don’t store them in a fridge or anything, just stick them in the cupboard.
Crips this stuff smells so good..Lid on for sure, lid off would let the flavour escape