I bought a used aproximately 300-gallon tank on a trailer. It was expensive for such a tank, but it is an old stainless steel Coca Cola fair pressure tank, so I think I won't lose money on it. I drag it around with a tractor, but a truck would work fine. My wife and I used it to start 1000 seedling pine trees during a drought about 20 years ago. It is slow with a hose, but if you water faster, the water runs off and does little good. We now get wood chips from tree services when they are in the area. They dump them on our place rather than drive further and pay a dump fee. The chips must be left for a year before multching if you don't want to plant unwanted weeds such as poison ivy (learned the hard way), but they really help conserve moisure. We now don't water but replant if we get a drought. Its easier.