Malgus had pride in his skills and powers, his appearance did not matter to him. Some of the other Sith were weirdly narcissistic about that sort of thing, something he did not understand.

He took a drink himself, as much as he could sustain himself with the Force, he was not foolish enough to dismiss the physical needs of the body. Liquid would help, especially on the dusty planet of Tatooine.

"Rage and grief, highly useful tools. I have fought Jedi who have fallen to those emotions, few have been successful."

Very few Jedi have matched him in general. There was one who defeated him due to her own will power and he almost died as a result (though it was his own that kept him alive).

"And you wish to know how to protect yourself from what? The Sith? Or the Dark Side?"