Best ever Blueberry Muffins

Sugar Topping
1/3 cup (21/3 ounces) sugar
1½ teaspoons finely grated zest from 1 lemon

Streusel Topping
3 T white sugar
3 T brown sugar
1/3 cup flour
5 T melted butter
Muffins
2 cups (or less if you are me!) fresh blueberries, picked over
1 1/8 cups  plus 1 teaspoon sugar
1 tablespoon water
2 1/2 cups  unbleached all-purpose flour
2 1/2 teaspoons baking powder
1 teaspoon table salt
2 large eggs
4 tablespoons (½ stick) unsalted butter, melted and cooled slightly
¼ cup vegetable oil
1 cup buttermilk
2 teaspoons vanilla extract

If topping with lemon sugar, stir together sugar and lemon zest in small bowl until combined; set aside  If topping the muffins with streusel, combine ingredients until it is the size of peas and set aside.