Since FL doesn't tax personal income, I'd treat it as a cost sharing arraingement with no intent to make a profit, provided of course that is not your intent. Sounds to me like you're just helping out a friend in need who is also helping you by sharing expenses. Now I'm not sure if FL requires an applicant (be it for welfare, food stamps or anything else) to prove that expense. But they may accept a signed and notarized document from you stating that the applicant lives with you and does "in fact" share your household expenses.
For ths SNAP program start at https://florida-foodstamps.org/how-to-apply/?utm_source=google&utm_medium=cpc&utm_campaign=FL_Food-S... to get an idea of what's needed. I would say that if the applicant is "in fact" paying half the expenses, then they should pay their share directly without you as the middle man.
In other words, when you get the electric bill and it's for $200. You make out a check on your account to FPL for $100, and your roommate also makes out a check for $100 payable to FPL. Taking you out of "the mix" as a middleman makes proving they are paying for their share of support that much easier.
