Each of your arrays
 only contains 1 string. For example, the
myBackpack.food array has 1 element: the string
'bananas,energy bar'. That is seen a a single item even though it contains a comma and space. Notice there is only one pair of quotes surrounding the string.
You can change that first string to
'bananas', and then on the blank below that add another string using the
str key. That will add the orange quote marks so you can type in your second item in the array. You’ll have to do the same for your other 2 arrays as well.
If you need any more help with this puzzle, you can check out the explainer for Get More Supplies.