At first, the ingredients would drop in a row from what the video showed, but they changed it and now if you dont have boosters the keys will not drop to get fruit. If you have the hand booster start using it when you have at least 5 left until all fruit comes down.
I past this level with 3stars-the key is not to use color bomb with a striped blue or green. If you do and clear the board you will not have enough level candies to win the game