Get your drinks to go from the Crazy Toucan rather than the water park bar
The Crazy Toucan restaurant has the balcony seating area you can see from within the water park. Although you have to access the restaurant (and balcony) from the lobby outside the water park, they have a bar that often has drink specials, is more complete and is generally cheaper than the quick service bar in the water park (which has no specials). Just order your drinks in plastic cups and you can sit on their balcony or walk your drinks back into the water park.