Soda bottles are designed to handle some pressure. Milk jugs might be air tight, but have you ever seen a jug of milk pressurized? Its just not what it was designed to do.
Now, having said that, any plastic or maybe even glass container will work for making co2...but the point is to go about it the safest way possible. If for example you would get a clog somewhere, and pressure would start to build up in your container, it is believed that a soda bottle would handle the pressure build up the best. The question is how much do you want to risk your sugar and yeast mixture splattered all over your cabinet.
Another point i can think of is that soda bottles are meant to hold some liquids and CO2, exactly what you will be making. So you can have some confidence that the CO2 will not react with the plastic of the soda bottle or the cap in any way.
Lastly...about the recipe, if you double the size of the bottle, double the rest of the ingredients as well. Just remember that a bigger bottle will give you more co2 but it will not make it last longer.
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