There is no magic "5 day" food ....
Goldfish will do fine up to a week without food, esp. if you keep the temp lowish (say high 60's for an oranda.)
Just feed well before you go, and do a water change as well. Ideally, you would want someone to check in on the fish at least once during the 5 days, but you *probably* will be OK without. <I am assuming the fish is fair size. Frys will not do well without food for such a long time.>
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.