Drink water or homemade Gatorade until you can afford the store-bought stuff. Just don't drink a large amount (>1 gallon), because that can dilute the blood and affect many of the body's systems. Stay away from soda, it does you no good and will put on weight on top of that. You may also want to keep a lid on the lemonade too, it has a lot of sugar and won't do much for your electrolyte balance. Try not to worry about gaining weight from a half-cheeseburger...I'll eat half a burger at Red Robin sometimes and I'm still losing weight (50 lbs. since my husband died in July). Just keep your portions small and don't obsess over calories.