Dexamfetamine and Coffee

Question : I’m doing protocol C with CDS, my chest has cleared up fast, but, dam it’s hard to go without coffee, do you think I might be able to sneak in a cup or two now and again mid hour? Also I not to sure if this is just in my mind, but I take Dexamfetamine and I’m wondering if CDS works against it? As my focus and up&go seems a little slow.