If water is with someone else while traveling or at the neighbors, is it permissible to perform tayammum?

The questioner says: Ibn Qayyim stated in 'The Gift of the Mourner': 'The saliva and spit of the newborn are among the issues that are widespread, and the legislator knows that the child vomits a lot, and it is not possible to wash his mouth, and his saliva continues to flow on those who raise him. The legislator did not command washing the clothes from that, nor did he prohibit praying in them, nor did he command avoiding the saliva of the child. A group of jurists said: This is an impurity that is excused due to difficulty and necessity, like the mud of the streets, the impurity after cleaning oneself, and the impurity on the bottom of the shoe after rubbing it on the ground.' I hope to clarify the meaning of vomit filling the mouth and what the standard of its impurity is. And if it is a small amount, is it considered excused? Previously, I did not take precautions against the vomit of the infant; what is the ruling on my previous prayers?

What is the ruling on the Adhan and Iqamah in the newborn's ear?

Is the vomit of an infant after breastfeeding considered impure? If so, this is a very difficult matter; it is more challenging than the urine of a boy who only breastfeeds from his mother, because urine is something that can be avoided, but vomiting is difficult to avoid, especially right after breastfeeding. How can a mother navigate this issue?

What is the ruling on insulting people with foul language?

If the purification of impurity is achieved by washing with water three times with rubbing and squeezing, how is the washing purified if we add cleaning substances to its water? Does this not change the nature of the water?

Is it permissible for a person to call the Adhan in the ear of a newborn over the phone?

Is semen impure?

I lied to my brothers that I saw our father in a dream; so that they would give charity for him or pray for him. Will I incur sin for this?