Decanter of Endless Water
Wondrous item, uncommon · 2014 rules, SRD 5.1
Action: command word pours water: Stream 1 gallon, Fountain 5 gallons, or Geyser 30 gallons in a 30-ft line (DC 13 Str or 1d4 bludgeoning and prone).
Also in the 2024 rules (SRD 5.2).