1up mushrooms make you level up 1 level. Drinks make your distance increase and Club cards allow you to get new clubs from the club maker.

Drink 1: As you are given control of your golfer after the conversation where you are paired with your partner in the story game head over the walkway to the right go in the lower door. Follow the path and you will be on top of the castle. Go left you should find stairs, look for a barrel and walk up to it and press A.

Drink 2: In the marion training ground look for klepto. Hit the bird to save koopa, he swims over and give you the drink.