Perhaps use a spoon of honey to sweeten drinks and continue to use sweeteners in moderation. Don't be afraid to use sugar, but use it sparingly and perhaps just as a treat (like with lemon on pancakes!) or eat it around training time when the extra calories and insulin spike will be put to good use.
There are a lot of "anti-sweetener" folk out there, should any of them wish to post on this topic and make "sweeteners cause cancer/tumours/hair-loss" or whatever other inflammatory claim is du jour
I will simply ask that you back it up.
To date I have seen one journal paper that links chemical sweeteners with cancer, but a) it was carried out in the 1970s, b) the method of sweetener administration was super-dosing c) the animals used were rats.
Since then a very large study was also carried out by scientists at the National Cancer Institute, involved 340,045 men and 226,945 women, ages 50 to 69, participating in a research project by the National Institutes of Health and AARP, formerly known as the American Association of Retired Persons.
From surveys they filled out in 1995 and 1996 detailing food and beverage consumption, researchers calculated how much aspartame they consumed, especially from sodas or from adding the sweetener to coffee or tea.
Over the next five years, 2,106 developed blood-related cancers such as lymphoma or leukemia, and 376 developed brain tumors. No link was found to aspartame consumption for these cancers in general or for specific types.
Source: National Cancer Institute