caffeine pills r bs, they don't work for me...
ur best bet would be homemade iced coffee ( so there's actually coffee in it, and not commercial grade coffee flavour)...
johnstan's recipe:
mix 1.5 spoons of instant coffee with 3 spoons of sugar
dissolve mixture in water( not too much, just enough to dissolve it all, leaving a syrup like liquid)
add milk ( any- full cream,soy,lite) to the syrup thingo
put in a bottle and then put in fridge for abit.
u'll have a nice tasting,caffeine full, cold drink, keeping you awake etc...
ENJOY