I keep a huge tub of this treat mix ready for the guinea fowl. I must admit most people let their guinea be free-range, and get 95 percent of their diet from foraging for bugs and ticks, eating grasses. However, I do keep a station set up with fresh water, extra feed and treats, just in case they want something more. This can be used for the chickens also, because they absolutely have a fit when I am mixing this up for the guineas! I always have to throw them a handful to enjoy, just so I can get past them to give it to the guinea!
Keep in mind these are TREATS ... these should not be used as their only source of feed. Also, please remember to provide water for all your free-range animals like the guinea. In heat or cold, even free-range guinea may have difficulty finding water sources that are usually available to them.