Water houseplants by soil moisture, not a fixed weekday
Check soil before watering, then water thoroughly when needed and empty drained water from the saucer.
Pot size, soil mix, light and room conditions change how quickly a plant dries. Iowa State University Extension recommends checking moisture regularly rather than watering automatically on a fixed calendar day. For many houseplants, feeling roughly the top inch of soil helps; succulents and specialty species need their own guidance.