You can use maple syrup or sorghum molasses or of course stevia to sweeten drinks. Like homemade fresh lemonade!
How about fresh fruit juice with some sparkling water mixed in it?
Fresh pineapple juice is sooooo delicious.
And of course there are fruit smoothies. Frozen bananas and a little water can make delicious "milkshakes." Add other fruits, nuts, spices, and/or cocoa powder. YUMMMM.
I don't know that anything can "equal" soft drinks. But there are lots of delicious healthy drinks out there!