protein from shakes for deficit?

i've read that if your bodybuilding or using weights you should consume at least 1g protein for every pound in weight. I have also read on some different bodybuilding forums differing advice in regard to taking protein drinks, for instance i read from some guy that i should only take a protein drink once a day after a workout and if i take a protein drink on days i'm not training i'm wasting my time, my question is, if i don't manage to reach my protein goals using 1 protein drink and protein from other sources each day should i supplement the difference with protein drinks as i'm having a hard time getting all the protein from other sources each day or would that be a bad idea? Do i also take the same amount of protein on non training days as i mentioned earlier i was told that this is of no benefit.
Thanks for any answers in advance.

* 1 gram per pound of LBM is the *minimum.*

* Consume whole foods or shakes at your leisure to reach your minimums. It makes little practical difference (in terms of muscle built) which the come from.

* Except post-workout when your protein should come from whey protein.

* Before bed whole foods or a casien based powder is best.

* The rest of the time, its not that important, so long as you get sufficient protien.

In sum, eat and drink up.

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Also, keep in mind that your muscles don't just grow on the days you work out. I imagine that getting enough protein on the days AFTER a good workout are nearly as important as the day of the workout.