Tools and manpower are needed to successfully complete a complicated project, but other factors are needed too. Common sense is another critical component. A hot day and hard work means sweat. The loss of water can make you overly fatigued and mentally cloudy. I always have plenty of water on site for my crew. It helps them and it makes their work more efficient.
If you are planning any outdoor activities, from a simple home repair to gardening, please keep your fluids up.