If you go to like Home Depot and in the garden section you will find a hose connection that screws on the fitting on the end of the water feed on the boat, and a quick connect fitting as well. I forget the brand name but it is green and black and sells for like $3.00 Each, get 1 for each engine. Then just attach the nipple end to the boat and the quick connect fitting to the hose. I also connect a on/ off valve on the hose to allow you to attach the garden hose, start it, and turn on the water with the valve. I made a y shaped hose to do both engines at the same time. Works great.
Karl