Ha Ha, yeah vinegar is the most accessible thing RIGHT now...I feel ya...
Um, this is an HR forum and vinegar can contain harmful bacteria that could cause you harm etc etc....make sure you use white distilled, preferably a new bottle, although not sterile and completely safe....getting powdered citric would be the better thing to use and so on and so forth!
But! to answer your question, for a .1, I think 5 Ius from a standard syringe should be sufficient to dissolve it, maybe add 15 units of water with it, just to dilute it and give you a little breathing room.....If that doesnt work, just add another few units of the vinegar until it dissolves...
Hope that helps! Mods, HR gurus and other concerned citizens, please don't hate me for revealing the "vinegar secret"!!!