Salt tablets are NOT recommended. Potassium is unlikely to be depleted by anyone eating a healthy diet, due to the abundance of it in meat and fruits. A person taking diuretics, however, may have problems, and may need medical supervision. Depletion of potassium can lead to heatstroke. A normal diet should satisfy the needs of workers in hot environments.
Alcohol reduces heat tolerance, and is a common factor in heatstroke.
It should not be consumed just before or while working in heat. Many prescription drugs interfere with the body's ability to endure heat. Diuretics and antihistamines are common examples. Ask your doctor's advice if you are taking prescription drugs and working in a hot environment. Generally, the body must work harder to maintain itself in hot weather.