In Oman they do take UAE money at some places. In UAE GCC Currencies are acceptable at places like Carrefour hypermarket. I am not sure about Bahrain , though Carrefour has branches in most gulf countries, I am not aware of one in Bahrain.
see website
http://www.carrefouruae.com/
they do have a Geant however
http://www.geant-bahrain.com/
By the way ATM cards work across GCC so that may be a better option as you will get the cash in the currency where you are. You can also use credit cards or pre-paid Visa cash cards. Checks are not acceptable.
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