Is it ok to defrost chicken (in a plastic bag) in water and then leave it in the refrigerator overnight?

No, The watr would be much too cold for a tropical fish like a betta. And it would still have chlorine and maybe even worse stuff like chloramines. Go get some water conditionor.

ASAP Or order some online with overnight shipping.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.