You don't "need" a heater or bottle opener, just nice to have but even then you have to reconnect the line (in a legal sense) to use the nitrous and all you have to do is turn the valve while you're back there lol
Purge, fuel rail adapter, and then the nitrous kit comes with the rest, also a higher pressure fuel pump
great safety features a window switch, and making sure you have a wot switch to activate it
If your using it for the track then no you don't need an auto bottle opener but for street I would. U don't want to get out of your car and turn it on when it could just be ready. As for bottle heater is nice when its cold.