Easy water level up
During your visit to dream castle in the zil desert go into the cellar where the zombies are
If you follow the wall around to the east kill the zombies ( will be easier this way ) and the lizards if you wish to then on the east wall will be holes with spikes what shoot out and give you damage ( they will not kill you ) then all you need to do is get one of your characters to use the spell heal over and over again and in around 30 min to 1 hour your water level will be 20+ ( when you get 20 you unlock the best party heal spell )
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