Elderflower cordial or lightly fizzy presse, chilled hibiscus or rosehip tea (stains your teeth though), blood orange or lemon San Pellegrino if you can get the Italian recipe one with sugar rather than sweetener (new recipe tastes vile sadly), or M&S do some really nice cordials and lightly fizzy drinks. I bought a can of peach and mango lightly fizzy spring water in the social supermarket yesterday which I'm hoping is nice!

Must remember to make some ice cubes!