1. Proactively encourage residents to rainwater harvest and provide subsidised water barrels.  
2.  The new reservoir should also cater for angling as done in most reservoirs.  Scaling Dam in North Yorkshire specialises as a trout fishery, not fly only and conventional bait can be used.  This can give confidence in relation to water quality and day tickets would cover the cost of keeping fish stocks high.
3. Southern Water tastes awful (I've lived in one of their areas) but Portsmouth water taste is excellent - I assume because it is artesian.  Please keep Fareham's water the same and let Southern Water and West Sussex have the water from the new reservoir!