Number of Items on My Refrigerator Shelves

I go grocery shopping every two weeks.

Here are the number of items on my shelves as they stand three days after grocery shopping:
If regular consumption holds, here are the number of items on my shelves as they stand three days before grocery shopping:
The top shelf apparently stays full--just the milk typically gets depleted. The reason is that water and extras stay on that shelf; by extras, I mean that those items move to other places as I run out of those items in the other places