herbal teas and multivitamin?

I fasted a while ago for 2 days and now want to complete a 10 or 12 day Water Fast for various reasons (break food addictions, detox, weight loss etc). My question is are you allowed to drink herbal teas or would that disrupt the fasting process. I think it would be easier for me if I could still have teas because they are warm and can help me relax. Also, for future reference (way in the future because I am not yet ready to do a fast lasting longer than 21 days yet!), would it be beneficial to take a multivitamin every day? I read somewhere that the human body can go 117 days without food so long as it takes a multivitamin and consumes 64oz water daily. Tweet