Its funny isn't it?A few years ago water tanks kind of went out of fashion,but then as water rates began to rise,they became quite popular again!Much more modern looking than your old galvo round ones.I realise you're renting,and Ive just looked at water tanks/butts online and their fairly expensive,so buying one may not be an option for you.As the weather warms up,you'll need to water so it penetrates deeper into the soil,otherwise if you're just watering lightly,it'll just run off the top of the soil.I watered at night time.No point in watering during the day.I believe a "soaker"hose was recommended a few years ago,but not sure if its still relevant.(They're the flat strip type sprinklers,holes all along,kids love to play in them lol).Only use grey water if the detergents are eco friendly.You can water plants with cooking water (if you steam veg,or boil,strain off and cool then use).