There are several options to store rainwater these being, standard Garden Water butts, IBC’s, water Carriers, some people even use buckets to capture and store rainwater but remember to have a good supply of stored water during the summer months, so you don’t run out and it will need to be regularly cleaned out to prevent algae growth. I had this problem so I decided to install a R.O system (Reverse Osmosis) and to be honest have never looked back and I think it cost me about £50.