https://www.dmsguild.com/product/206797/WH-Codex-of-Waves-additional-water-spells-for-all-levels

Aquabolt

0-level (Cantrip) Conjuration

You conjure a sphere of turbulent water and hurl it at your foes. Make a ranged spell attack against a creature within range. On a hit, that creature takes 1d6 bludgeoning damage and, if is size large or smaller, it is pushed back 5 feet.
At higher levels: The spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).