If you are playing Red: Go to the roof of the department store in Celadon City. There, you'll find a vending machine with Fresh Water, Soda Pop, and Lemonade. Buy any one you wish, it doesn't matter, and walk by the guard. He'll somehow know you have the drink, stop you, and take it. He'll drink it up, stop being thirsty, and let you pass as a way of thanking you. He'll share it with the other guards, too, so you only have to give a drink to one. If you are playing Fire Red: Go to the mansion or whatever it's called in Celadon City. It's the huge building where you can get Eevee. On the first floor, there's an old lady. Talk to her, and you'll get the item Tea. You can't drink it or use it in any way, or sell it. Take it to any guard you want, and he'll let you pass, and promise to share it with the others, so they will let you through, too. Good luck, Saffron's where the game starts getting quite a bit harder and more confusing, but it still remains fun!