The honey in this tea is added to give extra sweetness to the drink. So, if you prefer unsweetened tea, you can leave this out. You could also use simple syrup instead. To make this simply dilute a couple of spoonfuls of sugar in a small amount of hot water and leave to cool. Add a little at a time to the tea until you have the desired sweetness. You could also do this with powdered sweetener instead to reduce the calories in the tea.
The iced tea contains 39 calories per serving which will reduce to around 18 if you omit the honey or use zero-calorie sweetener instead.