As for the CRJ 200/700 its
a Galley water tank of 8 USG/30L
a Lavatory water tank of 5 USG/ 19L
and a toilet water tank of 18,5 USG/ 70L
reagrding the drink or not question:
"We have little saying out here: If it´s brown, drink it down, if it´s black, send it back..."
That's it! You people have stood in my way long enough. I'm going to clown college!