Check the "Darkroom Cookbook". You can substitute sodium bisulfate for sulfuric acid in most bleaches that call for it, although the quantities are fairly large. Sodium bisulfate plus sodium chloride can often be substituted for hydrochloric acid. Sulfamic acid is an often used dry substitute for sulfuric acid. (Warning: sulfamic acid is a strong acid, and it is just as dangerous as concentrated sulfuric. But it is a lot easier to handle.) Cupric chloride in a bleach is an interesting possibility, but I haven't tried it.