22,000,000 people / 2200 locations = 10,000 visitors per store, per week
I think 25 bottles per month is reasonable.
Also, lets not forget the fact that we're being PROMOTED through the "Eco Options program" and could see a high traffic isle display placed in each store.
PS: There are more than 4 weeks (28 day) per month, which makes it a tad easier to reach this per month figure.
365 days per year / 12 months = 30.42 day in a month.