Two new rain barrels

We recently purchased two new rain barrels; but unfortunately, they are not set up yet. We need cinder blocks to place the barrels on and rock to help level the blocks. After we get these set up, that will give us 6 (65 gallon) rain barrels. That may seem like a lot of water; but really, it is not that much. In our area, we have been in a drought and have been steadily using the water from our other rain barrels to water the garden, and actually ran out of water. So we had to use tap water to water the garden. In my opinion, the plants seem to respond better to rain water as opposed to tap water. And of course, during a disaster, the extra water on hand would definitely be a plus.