Try these. A suitable fruit juice would do also.

Joe

NEW WHITE COOKING WINE
1/2 c. white grape juice, bottled, as Welch's (4 fl. oz.)
1 tsp. rice vinegar

NEW RED COOKING WINE:
1/2 c. red (or purple) grape juice (4 fl. oz.)
1 tbsp. strong cold tea
1 tbsp. rice vinegar
Combine and use immediately. Use in lieu of wines called for in recipe books. Make tea by pouring 3/4 cup (6 fluid ounces) boiling water onto a tea bag. Press it thoroughly and let it steep until cold. Remove the tea bag and add the cold tea to the grape juice. Serve lightly chilled. It has an interesting flavor associated with some claret wines.