600 gallons of water is a large volume that is about the size of a pickup truck bed, heaped. To help you visualize it, this amount of water fills a glass 4.58 ft (1.4 m) wide.

Volume
2.97 cubic yards
2.97 yd³ (2.27 m³)
about the size of a pickup truck bed, heaped
Water typically ranges 1–1 g/mL depending on how it's packed. A firmly packed scoop weighs more.