Unless the pots are very large, I would not put sticks at the bottom as most plants need as much soil to grow in as possible. Pots are generally smaller than ideal because we like to be able to lift them and move them to another location on occasion, or for whatever other reason.
I would prefer to simply have a good mixture of
compost mixed with the soil and if you want to minimize watering manually, then put in plants that that can live off of the rain. They will need to be more drought tolerant than if you put it in the ground.
The exception if I have a very deep large pot and less root system in comparison to the pot, and need some filler then I could add branches or mulch at the bottom to use less soil.
I would mulch the surface of the soil with mulch to reduce evaporation and conserve as much moisture in the pot as possible.
Whenever possible it is usually better to plant in the ground than in pots.