If you have a scale that can measure in grams, it’s much easier.
For 1.3, 1/3 of the powder is 144 g. Multiply by 3 to get the total powder as 432 g. Divide by 5 and you get about 86 g. For the oil, 2 fluid ounces of oil should weigh about 53 g to 55 g. Divide by 5 and you get about 11 g.
As far as dry powder measurements by volume, I believe 1/5 pouch is about 2/3 cup. I think you would need to experiment to see how to get exactly 5 portions the same size.
If you are trying to measure the oil by volume, 2 fluid ounces is 4 tablespoons or 12 teaspoons. If you divide by 5, you get 2 and 2/5 teaspoon. You can probably approximate this as 2 teaspoons and 1/3 or 1/2 teaspoon. Or 1/2 tablespoon and 1 teaspoon. Or maybe a bit more than 3/4 tablespoon.