try to maybe add ice flakes or cubes to make a ice cold smoothie type shake.
I struggle too with the intake, I know tap water is fab.. but I found treating myself to some bottled water, I brought 'Love One' water, all their profits go to help finance water projects for those in need) It is only £2 for a multipack. I tried refilling a litre bottle but found I was always put off by how much I needed to glug, and daunted so drank it too fast and almost felt it sloshing.. but thats probably my failure :S
So by buying the little 750 bottles, I find they are easier to carry out and about, and a lot less daunting. I do of course refill with good old tap water when I run low and to make up my amounts. But I like treating myself, and it helps others, so rather than a take away I buy bottled water.. silly I know. But the action of sending money on myself gives me a little thrill and means I am less likely to waste it by not drinking it.
Quite a few of us are trying the lolly recipes too, so that helps to increase the intake.
I also add more water to the soups to make them less creamy, about 350 to 400ml, I find them more palatable, more fluid intake, and they go a little further