I would definately suggest using RO-DI water as opposed to tap water just for the fact that the cuttlefish and really all cephalopods are very sensitive animals. I wouldnt take a chance...I'd go with the RO-DI water. As for the wild caught creatures...Im not really sure so I'll let someone else answer it. BTW- I really hope youre right and that October will bring more cuttlefish...if anybody hears about any available cuttlefish...PLEASE LET ME KNOW!!!!