Google how to get the top off that amp properly.
Then throw the sodium chloride in the trash and order and HCG kit. (JK)
Unless you are doing a blast of a couple thousand IU's, 2 ml's is not going to be enough and you should be using bacteriostatic water.
The great thing about an HCG kit is its cheap... It's legal and available on Amazon.com.... And it comes with your sterile vial, all your pins, and 10 ml bacteriostatic water.