Scalp dryness

I find that my hair and scalp is always dry, how do I treat this problem?

Dry hair and scalp could be the result of many things, e.g. Stress, Diet, Illness or Bad treatment. I find that the daily intake of mineral, vitamin supplements and drinking lots of water, can begin to relieve dryness. Avoid using heating appliances too often. Use a silk or satin scarf to wrap the head up at night and also a good hair moisturiser.

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I would like to colour my hair, but hear so many horror stories. I do not know what to do can you help??