As long as you sterilized it useing heat and preassure, like with a presure cooker, then they will work perfectly. Refrigorate unused stuff and when you open the jar to use it make sure you have a nice flame within 3 feet to sterilize the air around you.
You only need 2 regulators. You can keep all of your drinking kegs at about 8-10 psi. You would want a seperate regulator to force carb your other kegs at about 35-40 psi, and note that you will want a check valve for each forced carb station. ( beer can creep up the gas line while you are...