I mix a month's supply of powder (everything but the oil and water) in a 5 or 7 gallon bucket
with a mixer that's powered by my drill in reverse. Pour it into a second bucket (to turn it
upside down) to do the final mixing of what was on the bottom of the first bucket. I measure
amounts on a digital scale in a very large bread mixing bowl (holds about 3 kg of flour) and
put it into the bucket for mixing. You'll be glad if you get a lid like this for the bucket.
See each recipe's mixing calculator for mixing any number of days you want of the soylent mix or
the vitamin mix. Just replace "Days to Mix" number with the number of days you want to
mix.
To save time, I mix about 4-6 months at a time of the vitamins and minerals (the pills go in
the blender with a tight lid...I put plastic over the blender and then the lid...the dust is not
pleasant) including salt and xanthan, and mix all in the big bowl with a whisk and store.
Then just add the number of grams of this vitamin mix that the calculator says. So it's
only a few ingredients plus this powder to mix up a month's worth. This method means you can
get good vitamin accuracy with a scale with 1 g resolution.
For example, for 180 days of vitamins/minerals, I go to the recipe calculator and choose 180
days. This is many multivitamin pills, but I don't count them, I just weigh them. The
calculator gives the number of grams of multivitamins to use, and the number of other pills
(I just round to whole or half pills) Then I blend them all up. Then add this to the powders
in the big bowl and whisk.