5 gals. will fill 8.5 plastic soda bottles
My concern was that the bottles would not seal tight enough to contain the co2. Well, as it happens, the plastic bottles of beer carbonated perfectly and were ready to drink in two weeks after bottling, just like 12oz glass bottles. I was very pleased with the results which has encouraged me to move forward with my plans to use this idea while in Mexico this year.
Saving bottles can be problematic down south as all glass bottles are worth money and require a deposit, so people return them to the store where they were bought. This means that it's difficult to collect enough for re-use in beer making without having to buy and consume large quantities of light Mexican lagers(not my favorite beer although Bohemia is pretty good). Whereas the plastic bottles are everywhere and pretty cheap. I could easily afford to purchase some inexpensive soda or water, drink or dump it down the drain and reuse the bottle for my purposes.
I thought that the amount of yeast dregs (a typical condition that occurs when bottling beer with priming sugar) at the bottom of the bottles would prove to be a murky problem but after carefully serving two or three pints of beer, the yeast cake (US05)remained undisturbed at the bottom of the bottle and didn't make the beer any more cloudy than the first pint drawn off. This will make it a lot easier for me to package beer for beer/food pairings and also to transport to the restaurants.
The down side is that once you open the bottle be ready to consume it all before it looses its carbonation and have a friend or two around because a two liter bottle is a little more than four pints.