My hen that died after I drained her fluid was very sick, had not been eating well or drinking. She had been on an antibiotic for a possible reproductive infection. Of course she was doomed at any rate, but I kick myself for not taking her general condition into consideration before deciding to drain her.
But we both know that even if I had remembered to hydrate her and beef up her physical condition, she wouldn't have gained more than a few more weeks from being drained. Ascites is a death sentence, whether death comes sooner or comes later. It was scheduled to come for her.