gallon

keep, hold, conserve / maintain

keeping, holding, conservation, retention / maintenance

tank (container) / tank (military vehicle)

water (sometimes cold and/or fresh) / drinking water / a fluid, liquid / a flood / (sumo) Short for 水入り (mizuiri): halting

a tank top (singlet)

one day

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

each person

(obsolete) drinking water