HIYA 2Relax - let me give u my personal experience on this topic. We were @ US/IOA from 8/3 thru 8/9. I found out that u can bring in snacks, water bottles in backpacks. What happens is that UNIVERSAL has these checkpoints set up b4 boarding the moving floors on the way to CityWalk. Each security guard gingerly peeks in ALL bags(no exceptions), but really doesn't dig deep. It's nothing like going through TSA. What I did was buy a case of 16 oz bottles of water(Walgreens) and I would freeze 6-8 bottles the night b4. By mid-day, they're well on the way to thawing out while suppling ice cold water all day. Also, the parks have a semi-large souvenir bottle that they r selling. Buying one enables u to get re-fills of soda/water for 85 cents!!! It was a lifesaver. The promotion @ the time was buy two, get a third one free. So, @ $7 a pop, I was able to get all three of my kiddos a souvenir bottle w/ unlimited 85 cent refills. Now the disclosure - the bottle says its only good for "the day it was purchased", however I brought our three on DAY 1, and we would return everyday with them, no questions asked - EVER. We used our bottles to our hearts content all seven days. And the variety of soft drinks and the various stands is pretty broad. For me, I enjoyed the COKE zero, while da kiddos enjoyed the rootbeer, and orange fanta. BTW- bottles can also be filled with ICEE, & u get a discount as well. I hope this helps out. ENJOY!