Good afternoon, I tend to spray mine once a week or twice in the hot weather, but everyone's different, don't spray in the evening as they must be dry before bedtime. As for food my Moustached Parakeets every day have of course fresh water, Tidymix parrot mix in a dish, another dish with various fruit & veg - sugar snap peas, carrot, apple,passion fruit - cut in half, (a favourite) corn on the cob, grapes, chillies, peppers, broccoli (not favoured) raspberries, blackberrries, strawberries, blueberries , cherries, piece of sweet orange , figs etc They have a selection from that list daily. About once a week millet spray, a few unsalted nuts - cashew, walnuts, almonds and so on. They also enjoy a piece of wholemeal seeded toast every morning when I make mine with a little local honey on.
Have you found any favourites your chap prefers yet.