Hardest time of my life for shopping!! (Doha)

Hi all,
Other day I went to city center for grocery shopping and had the strangest moment ever.

I had a list of product with me to buy, but since I am new in Doha and not familiar with most of the brands I could not choose among the alternatives. I never spent 5 minutes of my life to buy a bottle of water!! Cheese, chocolates, eggs..No idea! Although I am a marketing professional and familiar with some of the tricks, I fell into the trap of packaging and pricing :(

So the question is, is there any internet site about the regular FMCG products in which there are comments, reviews, comparisons with well-know brands etc? that would be very helpful to a total foreigner like me. Or if you have your own list, that is also cool with me :)

Cheers