When you show up on the jobsite, there are several things everyone needs.
Water-Bring a refillable water bottle
Sunscreen/hat in hot weather
Closed toes shoes with decent tread
Eye Protection. Must have for using power tools, mixing cement, driving nails, etc. Don’t bring your expensive shades. They will get scratched.
A basic tool belt is composed of the following:
Retractable measuring tape. 25′ is plenty
Other options include a chalk line, needle nose and regular pliers, tin snips, screwdrivers, torpedo level, speed square if you’re going to be cutting wood