Use a shovel to create an even resting place. Check it with a level in several places to ensure the ground is as level as possible.
Lay a four-block square of cinder blocks on the ground where the rain barrel will rest. Place the cinder blocks up against each other with the openings facing up.
Lay a second layer of cinder blocks, turning the second layer 90-degrees from the position of the first layer.
Repeat the layers once more each if you need a higher resting place for the barrel. The higher the barrel rests, the greater the water pressure.
Lay a wood pallet or several boards across the top of the cinder blocks. This gives you a little extra height and stability for the rain barrel by covering the cinder block holes.
Place your rain barrel on top of the pallet or boards.