Are their any Name Brand diet sodas that do NOT contain aspartame?!

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There was a Diet Coke made with Splenda but I don't know if they still make it.

You may want to look for Zevia sodas. Apparently, it contains stevia extract of some kind and eyrithritol--I assume much more eythritiol, but that's an assumption based on my knowledge of most stevia products (I work for Wisdom Natural Brands, the makers of SweetLeaf Stevia,[which does not contain sugar alcohols]).

Zevia advertises that their diet sodas are all-natural. You can find their ingredients online--they offer lemon-lime, root beer, cola, ginger ale, black cherry, orange, and Dr. Zevia (their version of Dr. Pepper)--I think that's all. However, I haven't tried them myself, but I am curious about them. I know there are people out there who really enjoy them, some people some flavors more than others. I think maybe they may be a little pricy, fyi. I've seen them at stores like Sprouts.

As a general rule, though, it is good to get off the soda addiction completely, you know, just sayin'.

Its easier to find no aspartame in clear diet sodas, ie sprite and sierra mist. I dunno about the rest.

drink water.