3) Q: Some people use an alarm clock. What should we do, when alarm goes on in a morning? Modeh Ani, Negel Vasser and only after this turn alarm off?
A: 1) if someone else is sleeping in the room, for sure turn off alarm first! even before Modeh Ani
2) even if no one else is sleeping, the obligation to wash is from when you get out of bed, so if you can shut alarm before getting out of the laying position, that is probably OK.
A: You are the second person to ask this question today!
Regarding your question: Yes, it seems that many Poskim (Eishel avraham and others) allow a drink in the middle of the night, withouth a complete Negel Vaser, rather a quick Netilah would work, no different than drinking during the day after touching a Mokom Mechusah. Likewise, one should indeed wash their hands after using the bathroom in the middle of the night. However, that hand washing doesnt require a utensil (Aliba D'Hilchasa) and even when being stringent and using a utensil, it doesnt require three (or four, according to the Gra) times per hand like Negel Vasser. Also, there is no problem of walking 4 Amos without the Netilah, during the night.
There are poskim that are machmir,but it seems that we go with the Mekilim.
Regarding Asher Yatzar when using the bathroom during the night, there are poskim that say to make it during the night, and other poskim that say that the Asher Yatzar you make in the morning will exempt this use of the bathroom too.
As far as your last question, i am not sure exactly, as all the sefarim discuss is "waking in middle of the night, with intention of going back to bed". I would guess, that if by going back to bed one will miss zman krias shema and/or zman tefilah, that would constitute going to sleep B'Issur and thus not be allowed and therefore not exempt from hilchos Negel Vasser. I will see if I can find a clearer answer though.
5) Q: A problem related to this issue [Negel vasser water being tamei] just came up in our house.
My husband taught me that the receiving vessel should be rinsed off three times with water from another vessel. He is makpid that anything that is touched by the negelvasser water should also be rinsed off three times. Recently the water wasn't poured out right away and the window curtain fell into it and absorbed most of the water. My husband doesn't know if just washing it in the machine is enough, if it should be washed 3 times, or if we should just toss it. Could you please advise?
Thank you very much.
A: Your husband is right to be careful with the handling of post negel Vasser water.
The water is only a problem while it is still wet, thus if water dries up, it no longer poses a problem of Ruach Ra, like most Tumah cases that need to be wet in order to be "huchshar" for Tumah etc. Thus, once the curtain dries there is no more problem, and you definitely do not need to trash it! (think about it: if it spilled on the carpet, would you have to rip up the carpet? Of course not!)
To satisfy all opinions, as well as to satisfy his hakpadahs and/or worries, if it washes easily in a washing machine, do that (once is enough). if it is hard to remove, you can wash the area that was affected with clean water and you will have eliminated the problem for sure