When it comes to making homemade peppermint tea, the type of water you use can make a big difference in the taste. Many people prefer to use filtered water instead of tap water, as it can help to remove any impurities that might affect the flavor. Filtered water also tends to be more consistent in terms of quality, which can help to ensure that your tea tastes great every time. If you don't have access to filtered water, though, tap water can still be used - just be aware that it may affect the flavor of your tea somewhat.