Argos have a cheap 6.5L slow cooker on offer atm, and I'm tempted. I usually do stews, etc. on the hob. The main reason I fancied one was for slow cooking joints of meat and whole chicken. So I would like to know if a slow cooker has to have a lot of liquid added to recipes. Could I cook meat simply marinated in olive oil and spices or would it dry out too much?