Start with jacking up the tire free from the ground, tyre valve at the highest point and take the inner part of the valve out. Then take a very thin tube, thin enough to pass freely through the valve, and put one end tight-fitting through the cap of a 1.5 litre Coke bottle. Cut the bottom out of the bottle, hang it upside down over the tyre and stick the other hose end into the valve. Fill the bottle with the liquid and go and do something meaningful. Come back after a few hours, refill, again go do and repeat until the valve overflows. Close valve, blow air and let the jack down. In the US, take a one gallon milk container; saves you checking ever so often. Takes quite some time but very cheap and I have a national reputation to keep up, don't I?