Goldenroad
Member
I use my Sodastream for much the same purpose, as buying carbonated water is generally (cheapest) $1 for 2L and there's no way in hell I can drink all that before it goes flat. Smaller sizes are significantly more expensive per mL.
I think it's about $20 ($35 minus $15 deposit) for a replacement canister, which is reasonable. I either drink it plain, with a splash of flavouring, some sort of syrup (for an Italian soda), or occasionally their Coke Zero knockoff as it's halfway decent in a pinch.
Best of all, no dealing with returning cans or bottles for deposit.
You should try out the Ginger Lemongrass syrup that my gf makes. Real simple. 1 cup sugar 2 cups water, 1 chunk of ginger sliced and some lemongrass sliced. Bring to a boil, let cool and strain out the ginger and lemongrass. We just put it in a plastic squeeze bottle. Delicious and dirt cheap to make. Great with vodka or gin.