Try creating a one page
form for yourself or employees to fill out everyday.
If it's just for you doing maintenance work this summer, then that's one thing.
However, if it will for you as a supervisor, and for people you have working under you, you'll need two separate sheets.
So if it's just you, include some or all of the following information, pending suggestions from other CB users:
Start time, end time, duration of lunch break, requisite expenses (with receipts stapled on), tasks completed, date, signature. Then you can hand
this information off to whomever is paying you, your business officer, or whomever. Just make sure they OK the format you will be using, and agree to trust you.