If I drink soda for calories, can I get fat?

I lost a lot of weight and I need to put it back on, because I'm always freezing, or I get alot of headaches. I started eating more but I don't like snacks that are high calorie. I like soda and juice, but I don't like high calorie desserts. I drink a lot of soda. I've already gained a little weight back, so will I still be able to gain weight if I keep drinking it?