If it's in salt form then it will be soluble. You can't just chuck it in solution though, you need to weigh it first and make sure the weight is correct as there is no way to know if you vendor has sent you exactly 1g for all you know it could be 500mg or it could be 2g.
Also if your going to be storing it in solution for more than a few days you'll need to have alcohol in your solution to stop bacterial growth. Using vodka to make the solution will work, no bacteria will grow in 40% alcohol.
If you have exactly a gram then i'd recommend dissolving it in 300ml of vodka, that way the solution is 3.33mg/ml and 1ml is a nice easy amount to measure out. I don't see the point putting it in caps though, the liquid will just eat through the cap and it's much easier to just swallow the liquid and it will come on faster than waiting for the cap to dissolve in your stomach.