That is 15 tsp of water.
25 mL is about 0.845 US fluid ounces.
25 teaspoons (US) = 4.2 fluid ounces (US)
2.5 gallons is 320 fluid ounces.
25 US fluid ounces = 50 tablespoons 25 US fluid ounces = 150 teaspoons
800 fluid ounces is 25 quarts.
2.5 US quarts = 80 US fluid ounces
25 ml = 0.845 US fluid ounces.
That is 25 cups.
25 US fluid ounces = 739.34 mL
25 fluid ounces equates to approximately 739 mL
25 US fluid ounces = 739.338239 ml
8 fluid ounces = 1 cup 25 fluid ounces = (25 / 8) = 3.125 cups