i bought the larger size, comes in a tiny bottle, not the envelope packet for the smaller size.
i put about 20 drops per ounce. i do a bunch at a time, then i have it ready to go when i feel it needs it. (i'll grab a bottle of conditioner that has been started so i have room to add drops and shake well.
at first i'd do it on a each time basis and that worked as i experimented with different conditioners. i think there is plenty of room for more or less, see what your hair needs.

there is more info on this in the gray hair journey thread. if you go to that thread and do a further search within that thread, it should come to these posts.
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3a, some 2c & 3b, medium texture, porosity normal, low elasticity
washing/cowashing, conditioning, protein tx: curl junkie products
leave in:cj conditioners and treatments as leave in
styling: cj pattern pusha, cj honey butta leave in, cj cccc, cj ciab, lalsg. cj aloe fix gel is my high dews/summer HG!!
sealants - spiral solutions emollience butter, jane carter nourish & shine