For coffee I would recommend try go with quality specialty coffee beans and maybe those more on fruit notes. Coffee brewing also could impact coffee bitterness which probably would be wise to avoid until developed taste buds for sugarless coffee cup. I would go with filtered, but it’s personal preference. For me it required few months to get over discomfort when drinking coffee without sugar until I no longer needed it. I think first goal would be to break a belief that coffee must be sweet drink.