If all of the lines of business are separate, you would report the expenses separately. If the businesses are similar and/or operated within the same LLC you would report all of your income and expenses on one Schedule C.
You don't need to itemize out the expenses based on where you purchased the items.
Instead of including separate lines for Home Depot and Lowes, for example, you can add up all of your Home Depot and Lowes receipts together and put it on one line for "Supplies".
