Here are the flower water I used in my previous recipes. Rose Water (Left) and Orange Flower Water (Right)
These bottles can be purchased at your local Middle Eastern or Indian Grocery stores.
I bought these from Yek-o-Yek at 3046 Main Street for under $4 a bottle. There are other brands but I think Cortas is more well known.
They are very pungent liquids so usually a few drops is enough for your drink.