I seriously doubt that any cruise line would deliver a cooler full of soda to your room. (that's a bit obvious don't you think??) I know that if you try to carry it on it will be consfiscated until the end of the cruise. Most cruise lines have unlimited soda cards for you to purchase. It not worth the hassle to try to "smuggle" soda onboard imho.
thanks for your opinion,
we were allowed to bring our own soda on board last summer. walked on with case of pepsi. .kept them cold in garbage sack with ice.placed them in the bottom of shower. easy to drain water and add ice. We don't like the ships coke products and soda card is not worth the price to us.