First off, be aware that you may ignore inventory completely if your gross receipts were under $9 million. In this case, simply report the addition of inventory as Materials or Supplies.
See IRS Pub 334 Accounting for Inventory under "Small Business Taxpayer"
When you reach several million in gross sales, a bookkeeper can handle inventory for you.
But if you wish to account for inventory, the cost of personal items brought into the business would be entered as purchases, even though you didn't buy them during the year. If you're keeping accounting books for this company, the value of the personal items would be a contribution from the owner/member and an increase in inventory.
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