The Toffees will be looking to bounce back at Vicarage Road after losing to West Ham United last weekend.
Watford are currently four points above the drop zone, but Benitez says they are dangerous.
"It won't be easy against Watford," Benitez told the club website.
"It never is in the Premier League, but it is a chance for us to show a good reaction and do better.
"We gave away possession in some situations that allowed West Ham the chance to continue moving the ball and managing the game.
"Then you have to continue defending and can be more tired.
"The next game will be an opportunity to do well and, hopefully, we can play at the level we reached in previous matches."
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