Well if you chop up carrots and apples into bite sized chunks, they last a long time! Just not too small!
Well done on ignoring him for mugging, that's a good idea! If you can, have a training session just about correct treat handling.
My mare likes to extend her nose and nuzzle for treats but I wait for her to look away, which is usually an accident at first, before treating. As for going for the treat dispensing hand, as long as he doesn't nip you, just keep ignoring him until he looks away and then treat and reward. The key is consistency! As long as you never reward for going for your treat hand, he will eventually stop doing it. Horses, like all animals, do what works for them.
I'm so glad you're doing clicker training, it really is a wonderful training method to add to all other methods.
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