Just use the PHB only, no supplements. Boom, done.
Mike Mearls (@mearls ) is working on a stripped down version of 5e called Moldvay. You can download the working documents on his patreon page: Mike Mearls Games | PatreonBesides Nimble are there other stripped down versions of 5e that aren't limited to covering levels 1-5 only (I own a few of those)?