Carbonating beverages

[hobbit709]

1. My refill for the 60L costs me $16.12 including tax

It will last me 3-4 weeks.
The carbonated water I used to buy costs me about $1/L. Lemon juice is cheap and that's what I use for flavor about 90% of the time. The once or twice a month that I drink a real soda, I get a Mexican coke down at my local grocery-usually a buck each.
I figure the initial cost of $90-including the spare 1/2L bottles has paid for itself since last spring when I bought it.
And I don't have to throw out a dozen plastic bottles a week into the recycling pickup.