I would think vinegar and baking soda are cheaper than sugar and yeast.
As long as the pressure relief valve works bottles will not over pressurize.
Coming from the beverage industry, I'll share some bottle info here.
Use bottles intended for carbonated soda not a tea or water bottle.
Soda bottles are blown from a heavier gram weight preform.
They are designed to handle more pressure.
When PET carbonated soda bottles are filled 50-75 PSI is normal.
After receiving a cap their pressure is around 14-30 PSI sent to market.
I can assume this is why 1-2 bar is green on their pressure gauge.
Over time PET bottles in a store will lose CO2, PET plastics are porous.
Thus flat soda from the store, too long on the shelf. The caps don't leak.
PET bottles are blown from an extruded plastic preform.
Seams that you see on the sides of the bottle are not really a seam.
It is a mark from the two halves of the mold, not a weak point.
Weak points tend to be in the feet of the bottle, 5 points the bottle stands on.
Select a bottle without dented in or damaged feet.
Dropped bottles should be discarded and replaced, creases create a weak spot.
Caps come in two varieties lined and liner less.
Pick one with a liner it has an extra membrane to provide a better seal.
Usually water bottles have no liner.
I am going to try this new CO2 method, I think instant pressure is far better.
First day on sugar and yeast is really weak.
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Growing is not that difficult.