Hi Terry, sorry I could not find soda bottles made into American flag. There is a site on pintrest that shows American flag made from plastic soda bottle tops.. Sorry. Hope you fine it.
Collect enough of the right colour bottles .
Push them into the ground neck first. Use a clear bottle for each star etc........
Hi Terry: Are you going to be putting this on something? You could cut the tops off, paint the bottles with red and white stripes, and some blue with white stars, screw them onto a board, starting with the bottom row, and there ya go. :) Other than that, I'm clean out of ideas:) Good luck