If you plan your potential resupply stops, you only need to carry enough to get from one stop to another a couple stops down (in case you miss one). If you have no idea where you can resupply, especially water, you best carry as much as you can on the bike (there are temporary cage mounts you can get for the frame, seatpost, handlebars, etc) and in your jersey pockets.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey