Bypass the bath and head for the shower

Adjust the amount of water for each flush of the loo (a brick or two in the tank is a quick saving)

Harvest rain water off your roof, store and use during rain-free spells

Fix any leaks

Re-use grey water

And save electricity!  You indirectly save water by using less electricity.  Water is used to generate electricity.  And then electicity is used to pump water - and the cycle continues....