悪水[akusui] undrinkable water
井戸水[idomizu] well water
一衣帯水[ichiitaisui] (being separated only by a) narrow strip of water
一水[issui] current (of water)
溢水[issui] inundation

飲水量[insuiryou] amount of drinking
飲料水[inryousui] drinking water
烏の行水[karasunogyouzui] quick bath
雲水[unsui] itinerant priest
塩化水素[enkasuiso] hydrogen chloride

洟水[hanamizu] nasal mucus
水洟[mizubana] runny nose
洟垂らし[hanatarashi] sniveler

洟垂れ小僧[hanatarekozou] snot-nosed kid
青洟[aobana] green snot (hanging from a child's nose, etc.)
青っ洟[aoppana] green snot (hanging from a child's nose, etc.)