yes
They cannot live with a land hermit crab because land hermit crabs live out of water so the fish would die (as you know) if it is out of water.
It would depend on what is wrong with the water.
Yes your crab is molting she took the water down with her so she can keep hydrated while underground for awhile.
every day
Her and the tucks
2.95 Liters
a well oiled machine
They mostly drank from spring water. If they didn't have water they would drink their own pee.
yes hermit crabs can eat water flowers.
Drank."I drank 4 glasses of water yesterday."
Because the sea water replaces the old water...
Land Hermit Crabs consume fresh water. It is suggested by some pet stores to have two watering dishes. One for bottled fresh water and the other for bottled salt water. The hermit crab can choose between the two depending upon the nutrients it feels it needs. If you do not have salt water- that is fine, it is not necessary.