Today is July 1st ... or as Johnny Manziel calls it -- the first day of sobriety!!
Earlier this week, Manziel told TMZ Sports ... he was cutting out all booze, partying and other stuff TODAY -- replacing it with a clean diet and exercise so he could focus on his NFL comeback.
Manziel has been partying in an expensive mansion in Cabo -- where at least one of his fellow house guests posted pics of baggies full of white powder -- but Johnny insisted it's not his stuff.
Question is ... can Johnny pull it together and stick to his sober comeback plan? He swears he's serious about it.
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