according to a nutrition website it has:
Purified water, citric acid, natural flavors, sodium polyphosphates, potassium sorbate and potassium benzoate (to protect taste), sucralose, magnesium sulfate, acesulfame potassium, potassium chloride, salt.
ideally, pure water is what you want to drink.. but if you absolutely can't stand drinking regular water, then this is OK. contrary to the quackery that you hear about sucralose (Splenda) being dangerous, it will not have any negative effects on you.