Can I do the CG method only with water?

I just started the CG(Curly Girl) method of washing and caring for my hair. The only thing is that I bought a big thing of conditioner that does have sulfates three days before I started. I really don't want to go out and buy another conditioner. Can I do the CG method with only water(i.e. wash my hair only with water)? I've been doing it for a couple days this way, and my hair isn't too dry(or at least no drier than it used to be and probably a little bit more moist). Can I continue like this, or will it not work as well? Thanks!

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