Well... if there is 1/8 (3.5g) of bud for 12-16oz of this mixture... ive read that 0.2-0.3g of weed are enough for a good effect, so it means about 1oz of your mixture...
Try drinking this amount with an empty stomach (as eating with a full stomach doesnt work) and wait some 2 hours to the effects start... if after it you were not stoned enough, drink some more...
Anyway, be careful to dont drink too much or you will be HIGHHHHH :stoned::abduct: