Rinse fruit. I like to scrub the sink, then fill it with water and fill it with fruit, then cover with water. This really loosens any stuck on dirt.
Core apples and pears, remove pits from stone fruit.
Cut into bite-sized chunks (cut apples into about 8 pieces), there is no need to peel.
Fill a slow cooker ¾ full with these chunks of fruit, add ½ cup water.
Turn slow cooker on low and cook, covered, all day (6-10 hours) or until fruit is soft.
Use an immersion blender to puree fruit.
*The small chunks of fruit can be frozen in a gallon zip-top bag for up to ~4 months and you can put the frozen fruit directly into the slow cooker, add the water, and cook on low. It may take the longer cooking time when doing this with frozen fruit