- Food cannot be summoned out of the air or else you wouldn't need house elves for cooking
- even the Weasleys who live countryside and are considered poor aren't farmers, as everyone knows Arthur is employee at the British Ministry of Magic and Molly is housewife
- not even the magical creatures are tamed and looked after for getting food. Have you ever heard something like the dragon tamers consuming dragon eggs or anything like that?
- and also the plants in herbology aren't there for eating as food but instead for their magic attributes
So you don't ever see any wizard there doing agriculture or anything like that.
So their food must come from muggles, right? But if that's the case - how do they pay for it? Wizards can't offer the muggles magical services cause that would be illegal. But if you remember how the wizards need subjects like muggle studies and don't even know how to use a phone or write a normal letter or anything, it's not very likely that they have muggle typical jobs they can earn money with...
I am confused (´•̥ ω •̥` ')