"Rose Flavoured Water" vs "Rosewater"
The "acid test" is to buy some of the suspect product (first examining its listed ingredients and rejecting if they are obviously wrong) while you also have the "real thing" on hand and make two batches of something, identical except for the rosewater or rose flavored water. 

Tasting should tell you whether you need to make the long trip, or not. 

For a very simple test product, I will reveal that rosewater is the "secret ingredient" in my lemonade (unless it's overdone to the point of not being at all secret, but I prefer it at the "keep them guessing" level.) No precise measurement/recipe for that, I do it by tasting as I mix.