Most of us know ipu to be the gourd we see and hear in the hands of many hula dancers and chanters. But it also has other meanings – it can be used to mean any kind of container; even a dish, mug, calabash, pot, cup, urn, bowl, or a utensil.
Pulu means wet, moist, soaked, saturated. When you got caught in the rain without your umbrella, pulu is the word you should've known. And if you want to soak something, just put the causative prefix ho‘o in front. Since pulu means soaked, then ho‘opulu means “to soak."