As a relatively infrequent flyer I was surprised by the way the restrictions are often stated in the media. You CAN have liquids and snacks on the plane. You can't take the liquids (as described above) through security. I am rarely without a bottle of diet coke and was pleased to find that you can have it on the plane so long as you purchase it past the checkpoint. At least in the couple of airports I have been in, there is a lot of options past security.
So, pack your dry snacks, buy your liquid, jells, etc past security, and you should be good to go.