I have had good luck with these citrus flavorings - true lemon/lime/orange.

https://smile.amazon.com/gp/product/B004VND1XK/

I have tried some other fruit powder, and been very disappointed. The Navitas pomegranate powder I ended up throwing away, as it was really that bad. I have some raspberry that I need to finish, but it is also a dud. I'd love to find something that matches the true lemon/lime and offers more variety, but so far what I have tried has been a waste of money.