Our solution is to use the Blue Barrel Systems.

According to their website: 

• Totally modular, flexible, and portable (when empty)

• Visually streamlined for a clean, uniform look

• Made from repurposed barrels—an intercepted waste stream

• Plumbed underneath so that you can drain every inch of capacity—no pesky water festering in the bottom of your barrels at the end of the season!

• Designed to equalize, so all barrels maintain the same water level and function as one larger tank

• Meets all applicable code standards