I picked up a perfect plastic barrel at a farm supply store near Seguin. It only cost $28.00 after tax and fit easily in the back of my car.
I brought it home and put it on two nicely leveled cinder blocks I had sitting around. The top of the barrel has a nice square hole over which I stretched some windows screen on a wooden frame made by cutting pieces of wood at 45 degree angles. This will keep out the debris and mosquitoes. Don’t like mosquitoes. The top of the barrel also has a slot where the overflow can pour. I just had to shorten the downspout from the gutter over the garage and put the angled end back. Too easy.
It took me around 30 minutes to set up. All I have left to do is get a faucet and attach it near the bottom. Can’t wait for some rain now.