well, I know half and half is sopposed to be used BUT....you could use heavy whipping cream
use a double boiler and boil your buds in it...long enough to ectract the thc
add a little water when milk starts to thicken....don't want cream now
after thc is extracted, strain & remove buds and chill the 'thc milk' in the fridge for an hour or so (just to cool it off fast)
then make italian soda with that
i think it would work
if you wanna be more high tech about it....use pure thc oil.....i think thats what they use in those 'medical sodas' anyhow......but that is a lot of prep
then again, all GOOD cannacooking or cooking in general needs prep