first time experience + question about extraction

[special-kid]

This is a first-time experience:
SWIM bought 2 bottles of cough syrup (DXM-only) which sum up for 300 mg of DXM. SWIM drank both of them, not chugging all the quantity but over 5-10 minutes. SWIM feels dizzy, yet no trips occur yet (after 20 minutes of the last sip). Maybe SWIM needed more, because all his first-time experiences showed that he needs the normal dose or even more (pretty tough body). How much should SWIM try the next time (probably in 3-4 days :P ) to make sure he will have the "time of his life"? =)) Or should I switch onto cough pills?

SWIM also has a problem with extracting from syrup, being unable to find liquid ammonia, only some weird powder called "Ammonia for cookies", manufactured by "Dr. Oetker". Can he use this by mixing and stirring it in water? What are the quantities required for a good solution? Same question applies for citric acid. SWIM really wants to extract it next time as drinking the syrup is pretty f**ked up. Not a bad taste, but very oily. And if 300 ml of syrup weren't enough for SWIM, that means he'd have to drink almost half of liter of that syrup!!!