New answers tagged water
As already mentioned in the comments the Aruch HaShulchan qualifies the statement in Shulchan Aruch that one may eat temporary eating without removing Tefillin by saying (O.C. 40:5): וזהו לפי מנהגם שהלכו כל היום בתפילין, ולא לדידן. ונראה לי דלדידן לא נכון גם אכילת עראי בתפילין This is according to their custom that they went the whole day in ...
In the sefer Minhagei Chasam Sofer (ס'א) it is written that the Chasam Sofer's custom was to learn with his teffilin on, and while he was learning he had coffee brought to him, and he would drink.
Possibly the point of the upward flow was to make the pillar of water visible to all the inhabitants of Canaan. This is similar to requirement that the Jews leave Egypt during the day to demonstrate the powerlessness of the Egyptians.
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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