In the ‘Unbathil Enbadhu’ upanayasa series, Sri U Ve Kannan swami mentioned that (unmarried women and men who have not undergone upanayanam) should not partake food cooked by those who have not performed samashrayanam. It is also applicable to those who have undergone samashrayanam but do not adhere to the ordained orthodoxy. What are the points that one must follow after samashrayanam?

After Samashrayanam
It is very important to partake only the food that has been offered to Bhagavan; food that has been offered to Perumal in the Vaishnava households.
Food that has been tainted with saliva and other impurities must be avoided.
One has to perform sandhyavandanam every day and keep performing mantrajapa to the best extent possible.
These are to be adhered. For a woman, marriage is like the upanayana samskaram, a man qualifies to prepare food in an orthodox manner after upanayanam and a woman acquires that right after marriage and not before that.