What would you do if Word War 3 beings?

i'd just die man, what about you? gonna kill someone?

I disagree. I feel WW3 would be more biological and radiological warfare. In fact, something like that would probably start by accident with soemthing getting out of a lab and a country would seek to exploit weaknesses in those affected, by offering aid but with a real intention to overcome and exploit the country's natural resources (oil, etc).
What would i do? Funnily enough, i have a quick list of items to grab & things to do. Like obtaining enough water (which would undoubtedly become quickyl contaminated), power supplies, fuel & loads more fuel!) and some basic creature comforts for Shelter, Food & Warmth. Probably a weapon of sorts and drive off to the countryside away from civilisation.

Tbh, if World War 3 started I don't think it would be a all out chemical war like you claim. I feel like it'd be a mix of gunfire and a cyber war. As for what I would do I wouldn't do anything. Why fight for a country who gives zero shits about you? I think I would mainly play Sound Voltex and watch some anime.