I am looking for a most unusual drink ...

I drink water, still and carbonated, tea, herb tea, one coffee a day.

It would be lovely to find a harmless, nicely flavoured fruit drink, that I liked so much I wanted to drink it by the litre.
But I haven't found it yet.

 

I drink Pepsi max but only with meals and a small glass only, the rest of the time I drink water or black coffee occasionally black tea and wine - but that's a given

 

I love and drink tea a lot and drinking any fizzy drinks in a regular basis will do some harm. I only drink sugar free drinks, maybe a couple of times a year.
Good luck in your search

 

The Robinson's No Added Sugar range is nice, I like the Orange & Mango and Apple & Blackcurrant flavours.

Also Green Tea is nice & refreshing

 

I have water, fizzy water, posh teas ( to make it seem like a treat), posh coffees, and I sometimes make fruity water by either squeezing fresh lemon or lime juice in or infusing a few berries in there.

 

Obviously the best thing you can do is not to drink Diet Coke, or similarly acidic drinks, but have you considered using a fluoride mouthwash? Tablets wouldn't have the same impact, and periodic applications of fluoride gels would probably not be so good.

If you don't fancy just buying some and trying it, you could ask your dentist to recommend a particular product to you?

To be clear, using a fluoride rinse won't repair the enamel erosion you have, but it should stabilise it.

In my mind, I have something like this: http://www.boots.com/en/Colgate-FluoriGard-Daily-Alcohol-Free-Flavour-400ml_1319764/