"I was frequently reminded that 'thoughts become words, words become actions, actions become habits, habits become your character and your character becomes your destiny'. My dad was gifted at helping me be more thoughtful with my words and actions, and make better choices. He was the kindest person I knew."
Taking food to someone who is reading or playing a game or watching a movie and just putting it where he or she can reach it without any instructions, warnings or reminders is a great gift. It is a simple gesture, and a profound service.
When the path is clear and easy, relax and enjoy the peace.
When you come to obstacles or there's more than one path, you'll be rested and prepared to choose based on what you know and what seems to lead you nearer to safety and growth.
An adult with 20 or more children to watch will say "Don't touch it" quite often. An unschooling parent might rarely need to say it, being close at hand.
As my children had examples of people being gentle with their things, and were with me when I was gentle with other people's things, it was easy for them to learn to examine objects without being rough or careless.