A high school in San Mateo is holding a canned food drive with a goal of collecting 300,000 pounds of food. While some suggest donating perishable items like watermelon, the document clarifies that only non-perishable goods can be donated. It recommends donating rice as it is non-perishable and will help meet the large weight goal of the drive, and also suggests donating canned foods like Spam and other canned items.