Coffee enemas

Hello

Started MMS1 2 days ago 
I have read not to combine coffee(and antioxidants in general), I am wondering if coffee enemas will be fine. I have been doing 2-4 a day for a few months now. Also, can anyone give me a definitive answer on whether stainless steel or plastic buckets are preferrable for MMS enema? I have read stainless steel is compatible, another time have read it is not 

thanks
KN