Well feeding the duck is easy. Not sure if you're having problems feeding it, but do it like this:
Play mining game twice at 15k a try for 30 sec of digging, nets you 3-6 tickets a try. = 30k total
Pay to get into the zoo for 5k (think it was 5k, could be 10k). = 35k total
Pay for a stack of 10 tidbits to feed your Quaquack. = 35k and 7 tickets total
That's it, it takes you 5 minutes to get the food to feed your Quaquack. Unless you need tickets for something else in the fair (say you don't have a Quaquack and need insane amounts if you don't have the luck), it is incredibly easy to feed your Quaquack.