Don't worry about flavour, it doesn't affect the healing properties. In our world, there are multiple kinds of gels with varying effects, and they're identified by colour and taste. We call these "apple gels" because they're red and taste like apples. Here, if that particular flavour isn't available, you can either leave the flavour out or choose a substitute. What matters is consistency.

[A beat, and then-]

I'd definitely add some kind of flavour, though. Gels are gross without it.