If the meter does not read exactly the same, there is a leak. Place a bucket in the shower to catch excess water and use this to water plants. The same technique can be used when washing dishes or vegetables in the sink. Check for toilet tank leaks by adding food coloring to the tank. If the toilet is leaking, color will appear in the toilet bowl within 30 minutes.
Most replacement parts are inexpensive, readily available and easily installed.
Install a toilet dam or displacement device such as a bag or bottle to cut down on the amount of water needed for each flush. Be sure installation does not interfere with the operating parts. When purchasing new or replacement toilets consider low-volume units which use less than half the water of older models. In many areas, low-volume units are required by law. Consider installing an instant water heater on your kitchen sink so you don't have to let the water run while it heats up.