Rarely do I buy soft drinks, as I drink mostly tea and water. In the summer months however I do buy the bottle green cordials, they are very refreshing and light, and the delicate flavour and choice is good.
In particular I like the Ginger & Lemongrass cordial, this wakes me up and tastes lovely. I also like the others including the elderflower, Lime and I have just tried the Pomegranate and Elderflower which is very good.
I like to make mine using sparkling water, but you can use still. Also you could use hot water which I intend to try shortly.
The supermarket usually do some good offers on these for example the Pomegranate and Elderflower one I paid £1 for but the usual price is around £2.50 per bottle. Sold in health food shops and the supermarket.
Also restaurants and cafes sell the ready made drinks which are really good.