The Sadhana can be performed at on any day; preferably in the morning. Take a Copper Kalash and fill clean drinking water into it, so as to make it 3/4th full. Then take any Japa Mala and place most of the Mala in the water so that when you start the Japa, each one of the Beads will come out of the water one by one as you chant the mantra. It any be any short mantra of any deity like Shiva, Ganesha or Vishnu.
For those who do not have a preferred Mantra, they can chant the Surya Mantra - Om Hreem Suryaya Namah [ॐ ह्रीं सूर्याय नमः ].
The after completion of the Prayog, pour that water into your drinking water vessel so that each family member can drink it. If you find this Prayog useful, you can perform it once a week.
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