Mix the plant-based milk and water together and heat in the microwave for about 60 seconds, until warm —think bathwater temperature, or around 110℉ if using a thermometer. Pour the warmed milk/water into a large mixing bowl, add the sugar and yeast, and whisk. Cover with a clean dish towel and set aside for 5 to 10 minutes. After resting, it should be very foamy. If the mixture is not foamy, your yeast is likely not active. Try this again with fresh yeast.
Next, add the flour, melted plant-based butter, and salt to the yeast mixture and stir to form a shaggy dough. Turn the dough out onto a clean work surface, and knead for 5 to 6 minutes until the dough is smooth and elastic. I like to knead by hand, but you can do this in a stand mixer with a dough hook, or in a bread machine on the dough setting.
Lightly grease a large clean mixing bowl with a bit of oil or more melted plant-based butter. Drop the dough ball into the oiled bowl and turn it a few times to coat the ball in the oil. Cover with a clean dish towel and set somewhere warm to rise for 1 hour. I used the oven with just the oven light turned on.
Once the dough has risen, it should be about double the size. Punch the dough down. Lightly flour a clean work surface, then roll the dough and stretch it so that it is a rectangle that is about 8" x 15".
Starting from the shorter side of the rectangle, roll the dough up into a log. Lightly grease a 4" x 8" loaf pan and place the rolled-up dough inside. There may be space around the dough, and that's totally ok, it will expand into the pan.
Cover with a clean dish towel and again, set somewhere warm to rise for 1 hour.
After the dough has risen the second time, preheat your oven to 350℉. Remove the dish towel and bake the dough in the loaf pan uncovered for 30 to 35 minutes until dark golden brown on top. Carefully remove it from the pan and allow it to cool on a rack.
Allow the bread to cool completely. Store covered at room temperature for up to 3 days, in the fridge for up to 10 days, or you can freeze it.