You need to water every day in summer. Your mix sounds like it should drain well enough to allow that. If it doesn’t then you need a better mix. That’s my experience. If you allow the mix to dry too much then it sheds water and is hard to rewet. By watering every day you probably won’t need a saucer under the pot. If allowed to get too dry a saucer will be needed in order to rewet the soil. With a saucer if you get a rainy period the mix can stay too wet and kill the lower roots.
You can’t set up a pot, at least here, that can be watered one or twice a week. If you could keep a small plant in a large pot, then yes. But anything I’ve grown just gets bigger until limited by pot size. In other words the tree grows as big as it can get on one days water. If you miss a day it wilts.