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At the top (not the lid) of the barrel, there needs to be an overflow hole. This is made by cutting a 2-inch hole with a hole saw. Now, cover it with window screen that’s been cut a bit larger than the 2-inch hole size and secure it by using silicone sealant. The screen is meant to keep insects from entering your water barrel and contaminating the water.

Using a jigsaw cut a larger, 6-inch hole on the top of the barrel and cover it with window screen to keep debris and insects out. This hole is where the water that has been routed from the roof will enter the containment barrel.

Place the barrel directly under the downspout to collect rainwater. The water can then be diverted to a garden area, or saved for drinking and bathing. The downside of a water containment system is the size of the barrels, making them easy to spot for the casual observer, tipping your hand to your preparedness should you live in a populated area. Their upside is they will extend your drinking water without having to haul it from an open water source. Check your area’s annual rainfall to make sure the expenditure of a water containment system is worthwhile before purchasing.