That is a good price, though if you add it up over time.. In a day you drink what, like 2-4 bottles? We'll go with 2 to give you the benefit of the doubt. Anyway, 2 x $0.40 = $0.80. Working 5 days a week, 0.80 x 5 = $4.00 .. 4 weeks in a month = $16 dollars and 12 months in a year, $16 x 12 = $192 a year.. which isn't THAT bad honestly, but if you just bought one reusable water bottle for a buck, then you'd be saving 191 dollars.

Just my 2 cents.