I think at $6 a month BayView that is quite sustainable. Last time while fuelling up I noticed our local servo had a special on : 2 bottles of water for $6. What's special about that? What a gimmick!
Does your tap at home or workplace not function? You are already paying for water through your rates. And, yes we do not need more plastic in the environment. Drink from a glass not a plastic bottle.
Living in a small community we use the Barter system extensively. I trade fish and assorted seafood for eggs, fruit and veg, beer, plants, sweets, and of course Money!