Heat the oven to 350 F and spray a 9-by-5-inch loaf pan with baking spray.
Bring the water, coffee, or orange juice to a boil in a saucepan over medium-high heat.
Put the dates, butter, baking soda, and brown sugar in a medium bowl. Pour the hot liquid over the date mixture and stir; set stand for 15 minutes to soften the dates and cool a bit.
Whisk the egg and vanilla into the cooled date mixture.
Combine the flour, salt, and baking powder in a mixing bowl and stir or whisk to combine.
Pour the date mixture into the mixing bowl with the flour mixture and gently mix until smooth.
Fold in the chopped nuts.
Spoon the batter into the prepared loaf pan and spread evenly.
Bake the loaf in the preheated oven for 45 to 55 minutes. Tent it with foil after 35 minutes. A skewer or toothpick inserted into the loaf should come out with just a few crumbs clinging to it.