That river in Egypt

With Rennala's empty cup in his hand, Damocles made the journey back to the kitchen. He was surprised to find that the floor felt like it was moving, or was it his head that was spinning? Who knew. Along the way he accidentally bumped into somebody lightly, but he figured that they wouldn't notice since everyone else was drunk. Everyone except Rennala it seemed, who was drinking up all his juice.

At last he made it to the table in the kitchen, standing by the drink table. "Okayyyy a 'Sex on the beachhh'" he thought. He placed her cup down and looked around for the ingredients. He poured some peach Schnapps and Vodka in together. Rennala had the orange juice, but he forgot what the final ingredient was... He vaguely remembered, what was it again?