Where can I find Gatorade?
@Cozmo but you can only buy individual ones not like a pack. Check out @American Products Center maybe they will sell in bulk
Where can I find blank/plain hoodies and shirts?
Head over to @Mlabbas they have blank hoodies for people that want to customize a design I am sure they can sell you the hoodie without anything on it
Where can I find a good quality Vaporizer?
You can't find any good ones here best option is to order online
Where can I change the battery for a Hublot Geneve watch?
I have a feeling that @Hublot may be able to help you with this :)
Where can I find a good (but inexpensive) coffee place for a semi formal meeting?
Best spot is @Majnoon Qahwa but I prefer their second branch not in Taj Mall they have plenty of space and especially great work space
Where can I buy sportswear?
@Adidas or @Nike but those can be a little pricy so I like to go to @Go Sport especially during a sale or surprisingly the Friday market can have some great sportswear brands but pay near to nothing
Where can I buy Nescafe Dolce Gusto machines?
You can find the Mini Me one @Virgin Megastore it's about 80 JD