i take a cooler full of ice and drinks to work every day just for that reason ...usually soda in the AM and switch to cran-grape juice or water in the afternoon ..since we work outdoor's in the summer i usually bring a big 5 gallon water cooler full of ice water or powdered gatorade for the guys who work for me ...a stoned employee is a happy employee but a thirsty dehydrated employee is unproductive at best