Everything you asked about is available here. Prices vary from place to place and brand to brand but in general you can find most essential stuff for reasonable prices pretty much everywhere(read hypermarkets,supermarkets,etc).
About Makkah yes road trips are possible and common from Qatar to Saudi. You can either choose to make the journey yourself or go by bus.Again prices vary but if you make the journey yourself it can be like 2000R pp depending on the hotel you stay in and number of days, etc.
Everything you asked about is available here. Prices vary from place to place and brand to brand but in general you can find most essential stuff for reasonable prices pretty much everywhere(read hypermarkets,supermarkets,etc).
About Makkah yes road trips are possible and common from Qatar to Saudi. You can either choose to make the journey yourself or go by bus.Again prices vary but if you make the journey yourself it can be like 2000R pp depending on the hotel you stay in and number of days, etc.