My Guru Maharaja, Srila Bhakti Prajnana Kesava Gosvami Maharaja, used to teach all this to us. When you are going to give any water from any vessel, you should not put your nails in the water. If you are cooking and you are putting some salt in dahl, or any other preparation, you should put the salt away immediately, before offering the dahl; otherwise it will become contaminated (juta).You should be very careful...