Go with a jar for sure, i use a small baby food jar for smaller amounts, like what you've got. I dont see a reason for freezing it, its such a small amount of time, and im not sure how effective it really is anyway. And make sure if you use the orange peel trick, only leave it in for a few hours or youll be risking mold, but if its nice homegrown just keep it in the jar until youre ready for it.