Congrats on a mostly great trip!
Fridge - you probably have the Dometic DM2652, which is an absorption refrigerator. AFAIK - these do not get "re-gassed" and I'm not sure that's even possible.
Its probably something much simpler, although it could need some trouble-shooting.
- Make sure the unit is level
- Pre-cool 24 hours a head of time.
- Move the temperature slider up. Its inside of fridge on the top right
Here's the manual if you want more trouble-shooting. Forest River Forums - Downloads - Fridge - Dometic User Guide (DM2652)
As for the water in the bunk, two simple things could have happened. First, did you season the tent ends by getting them wet and then allowing them to dry? This gives the seams a chance to expand and seal.
Second, it could be condensation.
It could be more but usually is one of these two issues.