Pour oil into deep heavy skillet, filling no more than 1/3 full. Heat on medium-high heat to 350°F
Beat eggs and water in shallow bowl. Place Fish-Fri in shallow dish. Dip tomato slices in egg mixture. Coat in Fish-Fri, pressing lightly; shake off excess
Fry tomato slices in batches, 2 to 3 minutes or until golden brown. Drain on paper towels. Season with salt, if desired.