I feel using water meters as a charging mechanism will penalise those on limited income more. Efficient water use involves both education and expenditure on efficient water systems.
I believe water meters should be just that, meters that households could use to get discounts on the current rates. I feel people are put off of water meters as they fear being charged more in a time where many are struggling financially. If you use the meters to educate people on their water use as a hybrid mechanism between water rates and actual usage would ultimately lead to increased water meter take up and lower water usage. I hope that makes sense.
Investigation into a household water recycling unit that recycles waste water from washing to run a washing machine for example or other such ideas, for which I have many. ;-)