I have trouble drinking enough water to hydrate. This helps a lot. I recommend that you determine how much grapefruit mix you use. It's the only flavor I like and soooo much better than the drops. And I've cut out hauling so many plastic bottles from the store.
I’ve ordered the SodaStream diet pink grapefruit flavoring several times. I like the refreshing flavor it imparts to my carbonated water. I get a lot of drinks out of each bottle and find it a great value and good alternative to buying diet sodas from the grocery store.