That's good thinking B A R. You might want to have a lie ready for anyone asking nosy questions.
The guy I learned this from suggested hitting up the recycling bins to acquire the 2 Liters. My town doesn't even offer recycling. Pretty sad that all the garbage goes straight to a land fill. And they call this the Evergreen State.
I too don't drink soda so I ended up buying all mine from Wally World. Their store brand was around $.50/2 Liter. Twice I filled up a cart with nothing but soda. "My daughter is having a huge slumber party for her 13th birthday." was the line I used when asked. I don't even have kids.
Last I looked they didn't even stock two liters anymore. I tried having friends save them for me but of course I didn't get one freebie. I figured that was an investment I was willing to make.
Don't attempt to put them through the dishwasher though. I ruined about a dozen trying that. The heat distorts them.
I'm contemplating, when I ditch the tent and buy a 1000 watt light, going back to the 3 gallon. trash can Hempys. I now have room to veg them for a while. Could prove interesting. But for now, with the exception of the Kerala Krushs, it's going to be 2 Liters. Pretty hard to argue the results.