While staying in a four star hotel you will be charged about 22-28 RMB for a coke.Walk out the hotel to a little convenience store and it is about 4-5 RMB.

Me and my friend had bowl of Guilin noodle soup and a Coke and the whole bill was 8 rmb.
Also paid 760 RMB was a nice seafood dinner for 5 people .
Taxis are cheap, seafood is fairly expensive.You should get rooms for 50 usd/night