You don’t have to do the same workouts and eat the same foods you did there. Find what you can do at home! Join a gym or take up jogging. Do weight training exercises with household objects, or perhaps look into exercise videos. There are tons of exercises and exercise videos you can find on Google or Tumblr. As for nutrition, it’s a matter of maintenance vs. weight loss. If you want to maintain your weight but keep a fit shape, use a BMR calculator to determine how many calories your body uses in a day to function. Eat that many calories. On days when you workout, eat back the calories you burn so that your total (eaten minus burned off) equals your BMR. That’s how you maintain. If you’re trying to lose, follow the same concept, except aim for 500 calories less than what your BMR is. This creates a deficit that accommodates safe and healthy weight loss. Check out the food pyramid for nutritional balance. :)