How to track founders investments ?

How to track founders investments ?

Hi all,

We have started a small business, and looking  for a good way to track founder expenses.
In the beginning i tough about using zoho expense, but now it seems that may be a basic mistake, as this are expenses and not investments (buying test products, inventory etc.).
We still dont have a company bank account so when ever we need to purchase each does it in his turn.  

Will appreciate any advice.

Yonatan.