Yeah I just finished my first run of crystal DNP. I work in a gov't building so I'm in a suit all day and 200 kept me ok. 400 had me dripping and looking like I mess. All dressed up in a tailored suit and sweating like a whore in church.
I'd recommend V8 and other things for electrolytes as it'll help with cramping. Also it takes until day 3 or 4 to feel your effects so play it safe until then.