Yes, in most cases you can freeze your meal prep as long as you follow a few guidelines. Store it in an airtight container and add a label and date to the outside. Generally, the rule of thumb is that you can freeze food for up to three months. Just keep in mind that the longer something is in the freezer the more apt it is to be damaged by freezer burn or take on an off-flavor. Some ingredients such as dairy-free creamy sauces, tofu and fresh vegetables generally don't freeze well in my opinion but sometimes it takes a little bit of trial and error.