you can get get plastic drain pans for under your washing machine,
dishwasher, hot water tank.

also
"Save Your Floors Dishwasher Leak Catcher - This innovative floor mat
slides underneath your dishwasher to divert any water leak to the front
of the dishwasher. This will allow you to see the leak and make
necessary repairs. No more rotted out floors or leaking ceiling below.
No special tools necessary." see at:
http://www.repairclinic.com/0081.asp...=1021760&Acc=1

"Dishwasher Installation Kit - Has everything you need to connect your
dishwasher to your waterline, including a 6-foot braided stainless
steel waterline, a 3/8-inch compression union, an "L" fitting, a "T"
fitting, a spool of teflon tape, two wire nuts and two wood screws"
see at:
http://www.repairclinic.com/0081.asp...D=959346&Acc=1