I am adding a co2 regulator to my 24 oz paintball tank with the adapter I got online.What I am wanting to know is how much pressure to set it for using a 2 liter bottle?Also do the cheaper 2 liter cola bottles bust easier than a coke or pepsi 2 liter and how many times can they be used?Also is there a simple cola recipe that doesn't require you to have a lot of hard to find ingredients?I have tried the soda stream cola and it tastes alright .