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As to transportation in NYC subways you may have some problems there because someone may think it is a bomb or something. Typically you should try and do any kind of transportation while the tank is empty, but that would be difficult unless you have a place to fill that is right next to your house. You may want to contact a fire extinquisher place (or talk to a LFS and ask them where they fill) and find out how they transport. You may want to bite the bullet and spend for a cab trip instead of the subway.
Some canisters have a cap that screws on or off. I doubt you'll get one with a 5g but you never know. That would help a lot. Even if you drop it I don't think it will explode or anything, you have to hit it pretty hard and just the right angle for it to become a missle. Again I would more worry about the security people in the subway.
For mine I have a pump in my tank and put the output of the CO2 into the exit of the pump. This pump pushes the bubbles out into the tank and chops them up a bit. So far I've got pretty good results.
I don't have a drop checker myself but plan on getting one as it is much easier to look at a drop checker than checking the PH, hardness and such to figure out the PPM.
Good luck!
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