A coke bottle should more than be up to the task of holding the psi a co2
yeast generating whatnot can produce. Now this does come from experience but the amount of pressure it takes to make a coke bottle explode is very high and if this is any consilation the noise that it makes if enough to break glass windows if close enough to the area of explosion. IE indoors. Outdoors exploding coke bottles are enough of an annoyance to make the neighbors call the local authorities, but that is with certain stuff that have a bit more power than yeast. Offcoarse the big 2 liters will hold less pressure than a one litter and a one litter will hold less pressure than the normal size coke bottle. So if you use one, use the one liter or smaller for high pressure and the 2 liter for lower pressures. This info is just for bottles that coca cola comes in, the quality of manufacture in other bottles has not been tested and therefore should be used at own risk. HTH
Dont ask and I won't have to Lie.