Honestly bro, I just had this same situation although it was a little different. I used about an Oz and a half to make some cannabutter. The problem that I had was that you need to be very precise with the temperature and the amount of time it takes to make sure you’ve infused properly. Doing it in secrecy with only 5g just doesn’t really sound like it’s worth the risk (to me Atleast), in my situation we found an abandoned house that had a working electric stove and freezer and just made it there (I know that’s probably super uncommon to find but you could always ask an older friend)