So i've done 5 recipes with the BIAB method an I wanted to know if i can make two beer out of one grain bill? And if so does anyone have a video/tutorial on how (I'm a visual learner).

you would need to do some kind of sparge to do this (called partigyle by the way) but I don't see why not. I would just do the biab and get the first wort done with no sparge, then sparge to get the 2nd wort. I would get a super fine crush to get good efficiency so you don't need all the sugars to get the first wort up to OG.

I had contemplated this too. your 1st beer would have to be pretty big in order to get a decent 2nd beer. something like an imperial IPA (with a target OG of 1.075-1.080) with the 2nd beer being an american mild/light pale ale (OG in the 1.035-1.040 range).

or make the 2nd running a smaller batch by boiling longer to evaporate more water and condense the sugars....could probably bump the OG of the 2nd beer into the mid 1.040s, but obviously lowering your yield in the process.

speaking of process, I would just do the normal BIAB for beer one, but then move the grain sack right into the pot for beer 2 (without mashing out for the 1st beer), and letting that steep for like a half hour or so at like 151°, then raise up to 170 and mash out for 10, drain the sack and boil away!

I guess I thought differently about the question. After the mash, split into 2 kettles with different hops, different yeast, etc. Or simpler, after boil split to 2 fermenters with different yeasts, dry hops, etc. Not twice the beer from one grain bill, but 2 different beers.

I see no problem with that. I have split post boil to try different yeasts.

yeah, a 10 gallon BIAB of a pretty generic grain bill of 2 row and a medium crystal... split into two five gallon batches... one boiled with english hops and fermented with S-04 would produce a nice english pale. the other five gallons boiled with a healthy hop boil of american "citrus" hops and fermented with US-05 would give a nice IPA. kind of similar, but kind of different at the same time.

Thanks for the advice, bu I was thinking more of how when people collect the "second" runnings of wort and use that as a possible table beer or small beer. That is what my goal is, or is this not possible with BIAB at all?

Meh... Unless you have a way to drain the wort runnings through a valve on your brew pot... Probably won't work with just lifting the bag to another pot... Since the mash is so loose in BIAB, you might not get enough sugars to carry over.

Nah, you can totally do it with BiaB. Cards and Natty are both on the right track.

The question is do you want a strong and small beer or 2 normal strength beers?

With a large grain bill you can make (first) one strong beer and (second) a weaker beer, or (if you have a way to reserve the wort) you could combine the efforts of a large grain bill for either a larger batch or two smaller batches (perhaps slightly different).