they sell a kit but DIY IMHO pretty easy to do
the one thing I am going to be doing to mine is changing to silicone tubing so there is no memory to it
http://search.nrs.com/boating/Hand Wash Pump
that one has a really nice pump like I want to get and the pumps run about $40 for that style so the made up kit is really not to bad a deal ? they used to be about $99 but at that price with the hardware not to bad
even if you end up with a hot water heater the pump thing is really really handy as I say to conserve water and just handy for dirty hands to not have to touch anything
one thing we did when we brought both for rinsing off etc... was to just dump the hot water pick up into the jerry can and then put the output back in also and just recirculate till it was the desired temp then used the foot pump to wash the kids