I really don't know about the money part. I have not heard of that being added.
As to the packages...they are usually personal care items like a comb, toothbrush, toothpaste, deodorant, soap, socks, etc.*
On the aspect of food...some people give a gift certificate for McDonald's, etc. as opposed to cash.
*These are the types of items the local homeless shelters request for such packages.