1. Drill a 1/2" hole into the barrel with a Forstner bit. Place the hole about 1 or 2" from the edge of the barrel (this will allow some water to stay in the barrel so wind won't blow it over; it will also leave room for connecting the top barrel to the bottom barrel). Drill straight into the barrel - don't let the drill lean to one side:
2. Optional step: use a tap-n-die tool to create threads in the hole. (At first, I didn't have a tap-n-die tool and I skipped this step. They leaked a drop a minute for a few days but then the tefflon sealed them up.) :
3. Coat a 1/2" threaded connector with tefflon:
4. Carefully hand-turn the threaded connector into the hole. Keep the threaded connector sticking straight out of the barrel (don't let it lean to one side). Once the hand-turning becomes too hard, you can use pliers. Leave a thread showing so that if a leak occurs, you have another chance to tighten another turn to seal it in place:
5. For each stack of barrels, add 1 connector to the top barrel (at the bottom), and 2 connectors to the bottom barrel (one at the top, and one at the bottom). See Red Arrows:
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