I bought the Hobby Lobby needle bottles today. They have a real short needle but will work if you just put the needle between the plug and the cart wall. I would prefer a longer needle but they will fill the cart from the bottom up. The cap for the bottle will not screw on with the tip in place so unless I can find a secure plug for the needle tip they really aren't designed to be carried around in your PV case.
Time to try another one.
Kevin