weapons in the death passage (Deus Ex: Mankind Divided)

I have such questions where, after the first mission, where you get to the city, you can already find more cartridges for the tranquilizing rifle, otherwise I almost spent everything on the first mission. I have 3 potronas left there, I kind of bypassed some merchants, but there is none. Tell me the place on the map, who knows in the location of Prague, the city where they can get them, or a merchant on the map that sells them. I haven't found it yet. Otherwise, I play deathly and apart from this tranquilizing rifle I have nothing yet.
And the second question is the gas grenade, is it meek or not? Otherwise, the description is incomprehensible. Can it be used so as not to kill?
And on the thrones, there is still the same question, are there any other thrones so that they would not kill and stun them like that, well, or something like that except for tranquilizers? So I found a shock pistol from a merchant, he sold a shock pistol to him, and what kind of thrones go to him and in general you can somehow look somewhere in the menu which weapon can be upgraded from meek to deathly? and just do it possible so? Well, that is, the topic is such that at the beginning of the game I need to get hold of a lethal weapon to the maximum, if possible. It's just that one tranquilizing rifle runs out very quickly, but it’s necessary to somehow get out of it. In general, who knows, please tell me