During the month after June 30, 2004, through September, 2004, and the months of May through September, 2005, the Secretary shall modify eligibility criteria, at not more than 1 private nonprofit residential camp in each of not more than 2 States, as determined by the Secretary, for the purpose of identifying and evaluating alternative methods of determining the eligibility of residential private nonprofit camps to participate in the summer food service program for children established under section
1761 of this title.