" I'M A HUGE PETA/ANIMAL RIGHTS PERSON AND I WOULD NEVER LEAVE A FISH IN A BOWL TO SUFFOCATE!"
And yet this is what you are doing.....
Drop 2 weeks worth of food into a tiny unfiltered bowl of stagnant water, and leave it for a week? Dead fish, 100% certain.
As you are stuck with the fish I suggest you find a big plastic storage bin that you can fill with water. Fit some sort of filtering, even an air powered sponge filter, and just leave the fish there. The filtering wont work properly as it's not cycled, but the large volume of water and oxygen should let it survive.
What you need to understand about keeping fish is ALL fish produce waste ammonia which is highly toxic to them. In a small unfiltered container this builds up in the water and poisons them. This is usually the reason that goldfish die, not starvation or lack of oxygen. To stop this happening you need either a huge volume of water (to dilute the waste), or keep changing the water frequently, or ideally having a filter system that breaks down the waste. (or all 3 things)
You obviously care about animals, so do the right thing for the fish. That little fish could grow to a foot long and live for 20 years with the right care. Or be dead in 2 weeks.. Your call.