The bulkhead on my water reservoir leaked a bit when I first installed it. It's because I didn't drill the hole 100% straight and it was at an angle just a hair. So I took some non-toxic quick drying silicone and put a thin layer around the bulkhead before trying to install it again. This fixed my leaky problem and it has never dripped water since. If yours just started leaking, it could be an O-ring going bad. I'd say, try replacing the O-ring or try to put some silicone around the bulkhead and re-installing it to see how that works.