The Fruit Location is as follows:
-The Cherry is in seen in Round 1
-The Strawberry is seen in Round 2
-The Orange is seen in Round 3 and 4
-The Apple is seen in Round 5 and 6
-The Melon is seen in Round 7 and 8
You need to eat one of each in one playthrough, meaning you would have to survive until Round 7 (or 8 if you missed it in 7), if you die, you'll have to start over
When you see the fruit, stop everything you're doing to eat the fruit before it disappears, each fruit shows up twice in each round, but if you die when the fruit is active, you lose it. If you miss both, you'll have to restart. I recommend eating the Power Pellets when:
A) The Ghosts are chasing or surrounding you
B) When the Fruit is active
C) To get some time for eating the Pac-Dots
It will require practice, but once you get the hang of it, you're good.