According to this article from the Kof-K one is obligated in covering water bottles, but we dont practice today as snakes are not common, but what if i lived in a desert like city, like Phoenix Arizona, should I make sure to cover my bottles of water? Is there still a reason nowadays to be concerned for snakes?

  • MOKAY, welcome to Mi Yodeya, and thanks for bringing this interesting question here! I hope you'll look around and find other information of interest, perhaps starting with some of our other 200 animals questions. – Isaac Moses May 7 '15 at 13:01

Yes, you must cover them where snakes are common. The Shulchan Aruch Yoreh Deah siman 116 siff 1 says explicitly the leniency is only because snakes were not common amongst them.

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    Is a modern house even in, say, Phoenix AZ considered a place where snakes are common? – Double AA May 7 '15 at 13:18
  • @Double from the beginning of the Taz I would guess so. But from the tosafos in the first chapter in Chulin where snakes have super powers to go through dirt but not keilim, I would guess not. In general i always thought the Mechaber was a chidush. He lived in Israel and he is quoting European Rishonim. – user6591 May 7 '15 at 14:00

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