• milk and water

• hold water

• you can take a horse to water but you can't make it drink

• fish in troubled waters

• come hell or high water

• of the first water

• like a fish out of water

• throw cold water on

• keep one's head above water

• meet one's Waterloo

• be like water off a duck's back

• throw out the baby with the bathwater

• water it down

• spend money like water

• tread water

• in hot water

• water under the bridge

• pour oil on troubled waters

• blood is thicker than water

• in deep water