Here's how I handled my water problem...Go buy one or two of the 30 gallon plastic barrels, I can pick them up around here for $10/a barrel...
Go to Lowe's hardware and look at the faucets, now I tried a regular outdoor water faucet, you won't get much flow out of it, find the ones like go on a hot water heater, they are the ones that when you turn them on, if you look in the faucet a brass ball with a hole through it turns and have a straight handle that only takes a half turn to open...This type faucet is made to allow water to flow freely when not under pressure...

I then went to the area where they have PCV and found the parts needed to attach the faucet to the bottom of the barrel (these parts are similiar to how you drill a hole through a boat and attach the bilge pump hose to) Sorry I don't have the Lowe's part number, but you drill a hole near the bottom of the barrel and put the T-fitting inside the barrel, there is a rubber washer that goes over this T-fitting and then a PCV nut goes on the oustide, tighten them up. Put teflon tape on the threads of the faucet,
thread inside the T-fitting and tighten up and you have a water barrel....

Couple of things...Load the barrel in the truck before you fill it up...Water weighs 8 pounds/gallon so you don't want to have to move it far...Also, I use a 3-4 foot hose that I had when I replaced the one on my washing machine, it is plenty long when you pull the 4-wheeler to the truck bed to reach the tank...and an added benefit, when you fill up, hook the washer hose to your water supply hose and you can fill from the bottom up and won't have to hold the hose down in the barrel...Just make sure to remove or crack the lid when filling to let the air escape and when draining to allow the water to flow freely...