If speaking in the bathroom happens when one is relieving oneself, it is not allowed, and it is contrary to good manners and dignity. As for speaking in the bathroom at a time other than when relieving oneself, there is no text to indicate that it is not allowed.

If the sick person cannot do Wudu with water because he is unable to or because he is afraid that it will make his sickness worse or delay his recovery, then he should do Tayammum. If the sick people cannot stand, then he may pray sitting. If he is unable to pray sitting, he may pray lying on his side. If he is unable to pray on his side, he may pray lying on his back with his feet towards the Qiblah.

If the sunblock did not have any substance, or it had substance but it dissolved when water touched the skin, then it does not matter if you were wearing it while doing Wudu. However, if the sunblock has substance and does not dissolve in water, then Wudu and Ghusl done with it on the skin are not valid, and you must repeat the prayers that you offered after you did Wudu having put sunblock on your skin.

There is no difference between reading the Quran from the Mus-haf or reading from an electronic Mus-haf, or from pages on the Internet, or from the screen of a mobile phone. There is nothing wrong with reading the Quran from the computer screen without Wudu.