1. Water should be at boiling point when you pour it over the tea bag.
2. It might actually not be that bad to reboil water that's already been boiled once.
3. Only boil the amount of water that you need for however many cups you're making.
4. Warm your mug or pot first if you want your tea to stay hot longer.
Otherwise heat will transfer from your hot tea to the cold cup, and your tea will cool down quicker.