The well held plenty of good water, and Laura and Mary gathered bits of half-burned wood to make the fire, while Pa unhitched and watered the horses and put them on picket-lines.
A water horse (or "waterhorse" in some folklore) is a mythical creature, such as the Ceffyl Dŵr, Capaill Uisce, the bäckahästen and kelpie, as well as other water-dwelling cryptids.