What part of drinking water is a challenge? Imagine you turn up at work, your boss says 'Go home for the week, drink some water, film it. Don't worry, you'll still be paid, maybe a bonus even.' That's not a challenge, that's a day off. You'd be ecstatic, and I guarantee most people would turn out something twice as entertaining as Demi managed to. This is her full-time job, how does she not put more effort in?
Also, did she mention that she found it a hassle to get up for a piss, so she holds it in until she can't anymore? Who is complaining that they have to get up and have a piss a couple extra times in a day? She's literally at home all day.
She needs a hobby.