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Hi Rachel,
If you’re actually looking to “treat” urinary bladder crystals, a prescription diet is necessary. You may see urinary health diets that can use language like “supports urinary health”, which crystals may be a part of, but none of them can carry a label for treating or preventing crystals. Any prescription diet for that indication will work, it often depends on palatability for your cat. My own cat preferred Purina UR, but other options include Royal Canin SO and Hill’s c/d.
For dry skin, you’re best starting with an exam with your vet. It is possible for diet to be related, but there can be many other reasons for itchy skin exclusive of diet or protein allergies.