can i bring drinks and snacks for my kids into the park?

Yes, many visitors bring snacks and sandwiches. But I discovered late that inside there is a system of meals for the whole day, right that you pay and they give you a bracelet to present in each restaurant from time to time.

There is a bag check sercuity gate you go through before you enter the park. As long as it is closed package and nothing suspicious looking, you should be ok.

Yes. I have seen people with sandwiches and drinks in their backpacks. Especially if you have a little one there is no problems

Yes

Yes, I believe so.

Solong as the drinks are in plastic bottles and not glass, and as far as food yes you can, sandwiches crisps all that good stuff your okay :)

https://www.universalstudioshollywood.com/web/en/us/faqs/policies-and-restrictions