What’s the best, most efficient way to build water tanks? That question has been burning in my mind since seeing the extent of water shortages firsthand on my recent trip to Vanuatu. While looking and thinking about possible solutions, I’ve found numerous good ideas on the Internet such as this underground ferrocement tank made with mortar and chicken wire. This wouldn’t work in Vanuatu and on many other islands due to the rocky soil; however, it will work in many other areas. I love the simplicity of this method.