I’m not sure if I would be comfortable with that to be honest. The guys your friend introduces to the group know that you are a prepper and even if he is responsible for them will this really matter once SHTF?
I personally just tell people I know and trust and even then I don’t tell them I have food or water stored, just that I like survival and outdoor activities.
At the end of the day, this is just a personal preference and everyone has to decide for themselves where to draw the line of course.
Alea iacta est ("The die has been cast")