With the tires deflated, I put 5 gallons of antifreeze in each tire with a sprayer. Then I just hook my waterhose to fitting that reduces to 1/4 NPT you can get for $3 from Home Depot or any hardware store. I screw a clip on chuck onto the 1/4 NPT connector and hook my water hose up to the tractor tire, walk off and let it fill. Fifteen minutes later I fill the other side and walk off. When I am done there is about 40 PSI in the tire and I have to let off a bit of pressure. Since water does not compress, you don't have to let out much at all to drop the pressure.