Answer:
   
   No, all you have to do is avoid non-kosher food. Preparing kosher food
   in a non-kosher kitchen is possible (this arises when visiting or
   living with relatives who don't keep kosher) but it is much more
   difficult than preparing kosher food in a kosher kitchen.
   
   The practice of keeping kosher in the home, but eating non-kosher food
   outside the home is certainly better than eating non-kosher food all
   the time, but the kosher laws deal with what to eat, not where to eat
   it.

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