I've seenjars of baby apple sauce at all of the grocery stores. It's really east to make apple sauce though. Just stew some apples, throw in some cinnaman (apple juice or sugar if you want it sweeter), and blend it. If you don't have a blender just use a potatoe masher or a fork (the stewed apples are really soft).
Can't help you on the crystal light. Again, you could easily make lemonade though. Make a syrup to sweeten the lemonade (otherwise the sugar won't dissolve completely). In a saucepan combine twice as much sugar to water, boil to make syrup. Cool syrup to room temp. Use as much syrup as you want to sweeten the lemon water mixture.