Percy could use his powers over water to his advantage. For example, he could create water barriers to protect them from attacks or use water to wash away any tracks they leave. Annabeth's intelligence would help them make smart decisions about where to go and when to move. They'd also likely rely on each other's strengths, like Percy's physical strength and Annabeth's strategic thinking.
Well, first of all, Percy's connection to water would be a huge asset. He could sense water sources from a distance, which means they'd never be thirsty. In terms of combat, he could use water to his advantage, like making water whips or using water pressure to push back opponents. Annabeth would study the arena layout and figure out the best places to hide or set traps. Together, they'd form a strong bond and use their combined skills to outlast the other tributes. They'd also communicate really well, which is key in the Hunger Games.