Have no idea how something like the grainfather works regarding water requirements. But I'm guessing you could use a BIAB calculator and it would be somewhat close. I don't know how much water+grain one of those can hold at once.
This is the one I use:
http://pricelessbrewing.github.io/BiabCalc/
But looks likes they have their own, so I'd use that:
http://www.grainfather.com/#!brewing-calculator/cljs
As for the yeast, I'd really recommend using WY1968 and making a starter. You say you don't have the equipment, you don't need any to make a starter. You need some DME and a stove pot, and then some sanitized container to put the starter wort in (I use glass growlers, but you could even use a 2L soda bottle.) It's a very easy process and takes 20 mins or so the day before you want to brew. A stirplate/flask makes the most powerful starters, but just a starter sitting there on the counter is much better than none. I go by and give mine a swirl every time I walk by, and that's worked very well.
I do not care for the S04, others have had better luck. If you REALLY don't want to make a starter, you could pitch 2 packs of the WY1968.
Thank you!
Ill check those links and do my calculations. Brewers friend and grainfathers own have very different results. Maybe ill trust the gf one as im using it.
About the starter I have one question more. If I make astarter, would it make one pack of wy1968 to cover for 6g as the package says its for 5g? As it is very expencive I wouldnt want to buy two of those.
Thanks again