How to make different objects fall from sky like rain particles in Unity 3D?

I'm working on a college project, making a game based on the animated film Cloudy With A Chance of Meatballs. The movie revolves around a scientist who invents a machine and places it in the sky such that it makes it rain food items. So there's a "rain" of food items across the town. Following this concept, I want to add such a concept in my game, make it rain different objects (which will be models of food items that i will import into unity) in an infinite loop. Also, i have to make the character dodge those objects falling from the sky and if an object hits him, he dies or something. So how do i make it rain objects of my choice on unity?