In prison they get some ketchup packets, sugar packets some orange, and some bread, put into a ziplock, warm it under the hotwater tap, and let it rip.. Its called pruno..
You'll know if it was good enough for the whole time if the wash doesn't taste sweet at all when it stops.. (Granted it will also have sugar left if you mix to more than 25% sugar by mass with baker's yeast since that would produce more than 14% alcohol)..
It should work well enough, but the fact that it started just means there wasn't too much as far as anti-fungals go.. Yeast will eat each other, so there is usually ample nutrition to get things started no matter what..
Like I said though, you don't need to be picky with the food choice, worst case scanario is you learn that what you used had too many preservatives.. (Propionates are often used for that..)