Instead of taking the trouble to mix  2 flavours  here is an idea for you, the 2 headed or 3 headed shisha bowl.
“Aywah, Saet-Safa”
Even better, if you mix two different brands in one regular bowl ,lets say Nakhla mint with al-waha chocolate, you will not be succsessful. Why? Each has a different ammount of glycerin.AlWaha much more than Nakhla. It will make for an uneven burn, but you can do such if you put each separately in their respective bowls with no actual mix. The resulting mix is when both come down the middle  tube.
I’ve never tried the 3 head, and never mixed 3 flavours. Its an option if you want.
Here is the link
Don’t be a monkey, buy your own hookah.
Hookah 1
Yeah, they are good to use. I have one.
sweet
i bought one a year ago, its tits!!
good head
its a double header game
Use it quite often, great for mixing
Not only is it good for mixing tastes, it has lots of room for downward (and sideways) airflow.
Did you smoke hookah on top of Mt. Everest?
By the way, mixing in the same bowl is better I think but the writerhere has a point about mixing 2 different brands. One will often have a quicker smoking rate. Put in strawberry and bannana? You might just be smoking strawberry at the end.
fill em up