But you already weren’t allowed to campaign within 150ft of a poling place or 25ft of a voter standing in line. So, that would have already been a solved issue.
This is from the 2010 GA code.
O.C.G.A. 21-2-414 (2010)
(a) No person shall solicit votes in any manner or by any means or method, nor shall any person distribute or display any campaign literature, newspaper, booklet, pamphlet, card, sign, paraphernalia, or any other written or printed matter of any kind, nor shall any person solicit signatures for any petition or conduct any exit poll or public opinion poll with voters on any day in which ballots are being cast:
(1) Within 150 feet of the outer edge of any building within which a polling place is established;
(2) Within any polling place; or
(3) Within 25 feet of any voter standing in line to vote at any polling place.
Edit: I personally believe that the food and water restriction was to make people not want to stick out waiting 2+ hours in line. Unfortunately people seem to have to wait multiple hours every election.