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In the Talmud (Chulin 10a), Chazal taught that one should not drink water, wine or milk from containers that were left uncovered because a snake and its venom might have gotten into the drink and it will cause the person danger. Today, snakes are not commonly found and the Matei Yehonoson 116:1 says there is a heter to drink from uncovered vessels if no snakes are around, adding that one may be lenient because at the time of the halacha it was only made in a place where snakes were common. Nevertheless, I know people who continue to be stringent on this practice, even covering their water glass between sips. While I understand that poskim are stringent with regard to water left out overnight (see, e.g., Kitzur Shulchan Aruch 33:5), why should anyone need to be stringent during the course of a meal, when a snake would not likely crawl into a water goblet on a Shabbos table without notice?

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(FWIW I've never heard of covering a glass while at the table.) Do you know that the people who do so do so for the reason of not drinking uncovered liquids? –  msh210 Oct 23 '13 at 18:30
    
@msh210, I believe the Steipler was stringent on this point. I saw it by Rabbi Yehezkel Danziger (Art Scroll's Talmud editor), shlita, who did not impose the stringency on his guests, but accepted it for himself. –  Bruce James Oct 23 '13 at 18:35
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Perhaps they are careful lest they leave the table and forget to cover it then? AFAIK the original takana did not involve covering if you were there to watch. –  Double AA Oct 23 '13 at 18:55
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According to the GR"A, the danger of snakes is just one of many reasons Chazal had for that issur (see, for example, פאת השולחן הל' ארץ ישראל סי' ב' סכ"ה), so we have to follow their גזירות and תקנות even when the given reason isn't applicable. –  user3445 Oct 31 '13 at 13:48
    
I once read that Rav Elyashiv was stringent to cover even the water for netilat yadayim in the morning. He said the same reason as user3445 –  ray Oct 31 '13 at 18:52
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Rivevos Ephraim 5:11 writes that in Sefer Halichos V'Hanahagos page 59 (Rav Eliyashiv) was Makpid to cover drinks. He brings a story were he covered his drink when he left the room for a second even with someone else there. He also brings a story which happened on Purim where he left room then came back and said don't drink the wine because it was left uncovered .see it inside.

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This doesn't answer why anyone would be stringent in this regard. –  Double AA Nov 3 '13 at 20:40
    
The fact he was stringent shows there is something to it ,if you read the tshuvah he was afraid that nobody would watch it. –  sam Nov 3 '13 at 20:57
    
Why is your answer in the second half of your comment? –  Double AA Nov 3 '13 at 20:57
    
@sam what does it mean to "watch" the Rav's glass? Does it mean that all of the guests have to constantly focus on the glass, doing nothing else, or can one assume that not even one person at the table would notice something strange crawling on the table? –  Bruce James Feb 10 at 19:38
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Have you ever thought of snakes and their venom as people and their poisons? Perhaps the stringency should remain in place, as although snakes in their reptile form are not as common as they once were, the poison of people, is evermore prevalent and all the more so, regarding politics and people of power and the possible covert demise of your adversary. Kings often employed, tasters to taste their food and drink, in case a lethal poison had been introduced to their wine or water. As far as I know, snakes don't even have affinity with liquid substances within jars, but people do.

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A better example would be lead flakes falling from a painted ceiling into a water glass. –  Bruce James Feb 10 at 19:40
    
Not better - just another potential plausible cause of poisoning.. –  Digitaria Feb 19 at 12:19
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The Rambam brings this halacha in Hilchos Rotzeiach (chap 11:4), meaning that he believed that it was assur due to it being an actual sakana, and not for any ethical/mystical/spiritual reason. (Just as the gemarah in Chulin says - its a sakanah. The Shulchan Aruch does not bring down this halacha at all. I would note that the germ theory of disease was not discovered until 1900. At the time of Chazal and the Rishonim they knew that drinking water sometimes made people sick, but they did not know why. (See Dr.Chaim Soloveichic's Yayin Nesech Bemay Habanunim - thats why they drank so much wine - it did not make people sick).

In searching for a clue as to why it made people sick they assumed (based on the best scientific knowledge of their time) that it was due to a snake "o kyotze bo" that poisoned the liquid.

A Rationalist would use chazal's basic idea, ie. that its assur to do things that are dangerous (smoking, bungee jumping etc) but not necessarily be careful about the specific sakanah of uncovered liquid. A non-rationalist, would be doing a "minhag chassidus" by following this rule.

ZevWrationalist

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A rationalist might also follow the decrees of Chazal because that's how Halacha works... –  Double AA Feb 18 at 19:12
    
The Shulchan Aruch actually quotes it in YD 116 –  Double AA Feb 18 at 19:14
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