Install a displacement device in your toilet tank. Remember the toilet is not an ashtray or wastebasket. Check for leaks with dye tabs. Fix your toilet leaks immediately.
SINK Install a low-flow faucet aerator.
While shaving, tooth brushing, etc. turn off the water. Fix your faucet leaks immediately. When cold will do, avoid using hot water . Install a showerhead with a shutoff valve. Take shorter showers.