Hi @Katie Scott
I have developed a solution for you which can be downloaded at https://1drv.ms/x/s!AhGuERp4qV0Rhf1nio5YcbgWagpwfQ?e=FTzsBN - You can use the template or learn from it to build your Inventory system. (This is only an example and hopefully it helps lead you where you want to go).
To download the file go to the link > File > Download a Copy
1) On the Inventory tab you can edit things colored in Orange (if you want to remove the lock, unlock the worksheet with the password: password)
You can change the per person requirement as stated above.
You can change the Wanted Kits as your requirement stated above.
2) Go to In tab
You can insert a row with a date and what you purchased. This will update the Green fields on the Inventory tab using the Totals row.
3) Go to Out tab
You can insert a row with a date and what you gave to people for inventory. This will also update the Green fields on the Inventory tab using the Totals row.
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If this is helpful please accept answer.