https://www.sodastreamusa.com/60L-Carbonators-C38.aspx 60L for $29.99 (ignoring fixed cost of hardware and marginal cost of tap water)
https://shop.fairwaymarket.com/product/vintage-sltzr-1lt-pla... 1L for $0.50 (in Manhattan)
Possibly more environmentally friendly, though that's not obvious.
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http://www.frugalwoods.com/2014/08/11/how-to-cheap-homemade-...
Higher fixed costs, but if you drink a lot of carbonated water, you quickly recoup it.
https://www.sodastreamusa.com/60L-Carbonators-C38.aspx 60L for $29.99 (ignoring fixed cost of hardware and marginal cost of tap water)
https://shop.fairwaymarket.com/product/vintage-sltzr-1lt-pla... 1L for $0.50 (in Manhattan)
Possibly more environmentally friendly, though that's not obvious.
reply