I am an RN on a busy MS floor and this has been my concern too. My surgery is 3/21 and i have started practicing. I bought a canteen with a screw on lid and i keep it in my bag at the nurses station. I pull it out and take a sip whenever i can. I got a large one so i call fill it once before leaving home and not stop to refill at work. I bought a corkcicle brand. This has been working out great.