The water tank is a camp building that is used to store drinking water, dirty water, and toxic water. With each additional water tank you built, extra storage space is granted. Please note that all water tanks share the same value of water stored, therefore if you have two water tanks both at 40, then you only have 40 water, not 80.  

Level Materials Required Storage Cap
1 Initially Available 20
2 120Resource-plastic 60Resource-scrap metal15Resource-screw 40
3 200Resource-plastic 100Resource-scrap metal25Resource-screw 60
4 280Resource-plastic 140Resource-scrap metal35Resource-screw 80 (max)