Regardless of how many bottles I drink per day or per week or per month, I don't care how many bottles are packed per box. This is hilarious. Do you count the number of Ritz crackers per box or the number of cheese slices per pack or the number of glasses you can pour per gallon of milk? Do you then buy only enough to last exactly one week or one month? You buy the groceries you need, if you're smart you stock up, and you buy more before you run out of what you have at home.
Anyway, if all of the hinting is correct, 2.0 will be available this year in retail locations so you should be able to buy however much (or little) you want any time.