I purchased all of my DIY stuff the other day from MFS, but .... I forgot the flavoring. I am getting ready to order the flavoring (once I figure out what/how much I need. My question is, can I use flavoring from the grocery store (i.e. Walmart)? I am not a patient person by nature and I want to start making my juice ASAP. Also, what is the difference between regular flavoring/extracts and oils? I have read all the threads but still I am confused somehow. I hope you guys can help me 