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Vitamins are NOT a source for energy (calories). We obtain our energy from MACROnutrients - Carbohydrates, Proteins, and fats.
Vitamins are NOT part of the our body tissues, they are NOT building blocks but HELPERS in. We can Not live on vitamins but need food that provides energy and helps forms the actual tissues of our body
IN fact, we need food and certain minerals to best absorb ANY vitamin supplements we take.
You are about to make a very unwise,unhealthy choice for yourself. without proteins your body can not repair itself correctly, with out fats your cells become unstable without carbs your energy levels will suffer greatly "the process is much more complicated but this post would be pages long if it would explained in great detail.
Vitamins are called "Supplements" for a reason to "Supplement" what you are already doing, if you could live off of them they would be called "replacer's" or some other non sense like that.
Out of courosity though, if you did go on this "Diet" how would you go about it? would you take Capsules,Tablets,Powdered,liquid?
how would you go about taking Water-soluble vitamins?
how much would you take? (AI),(EARs),(RDAs),(UL) amounts?
what form would you take? Synthetic,Organic,Inorganic,Chelated,Time-release,