BonkTastic
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Even just a squirt from one of those concentrated lemon juice (the small plastic lemons) will go a long way to changing the flavour profile of water.
You can also just drop some fruit or vegitables in a pitcher and let it infuse the water; cranberries, cucumber, lemon, ect).
I bought a soda-stream, but I don't use the syrups. I just make my tap water carbonated, then add a squirt of lime from one of those concentrated citrus squirters.
Great carbonated citrus water on demand. It's all of the yum.