Good-Person
Captain Junkie
Volunteers don't get the privilege of having their feeding allowance being covered by the company they are working for. It's not a bad thing for such companies to pay for their feeding too but all of them are trying so hard to cut down on cost, thereby there's no room for paying for volunteers food.
I think that certain organisations may, indeed, offer food. However, I think that it may be complimentary, not an obligation. For example, a company may offer job. However, a few companies do offer complimentary lunch as well. So, it depends on the organisation and where you are volunteering.