Water, water everywhere and not much else to drink!

I like water as a cold drink, but not all the time.  I'm avoiding fizzy drinks for the obvious reasons, and squash because it's not a lot better, but that leaves a void.  Hot drinks are fine, I have a selection of teas that do the job.  But when I want a cold drink with flavour, without much/any effort, does the healthy eater have any recourse?

Food diary for today:

Breakfast: Last night's leftover potatoes and veg  and a slice of toast with peanut butter and jam.
AM: Packet of seedy oatcakes
PM: Soup made with green lentils, carrot, parsnip, leek, swede, kale, fresh lemon juice, turmeric, black pepper and reduced-salt marmite.  This was good - proof that you can pretty much hide anything you don't like in a well-flavoured soup!
Dinner:  More of the soup with a large jacket potato.  Loadsa fibre!   5 squares of dark chocolate, the first for ages!   Mug of chamomile tea.

I am not in any way punishing myself by having the same foods at subsequent meals.  I love leftovers of almost anything.  Flavours develop and blend, and I love to eat food that I haven't just had to make!!