Yeah!!...I would always include a water bowl Gillian,even if it is a small one.I'm sure de-hydration can be the number 1 killer of brumating reptiles!!
Mine are in a brick out-house at my mum's place...just installed a little heater as temps. have started to plummit here in England!...I guess Holland is quite cool now as well?..I'm gonna try and hold 11oC as a nightime low and try to keep below 15oC during the day.

I must admit I was baffled by the fridge???...tell us about it Gillian?.

Paul