Rec for lemon flavored liquid for picky person

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I want to try a lemon flavored liquid that has no pastry flavor mixed in (like pie crust or cake, for instance) and the sweetener is a known quantity. I seem to have issues with splenda and possibly some other sweetener (whatever is in Halo's Twisted Turnover gives me a headache but they refuse to tell me what's in it.)

I heard great things about Mr. Meringue so I emailed the company to ask them about their sweetener. They could not be bothered to respond.

Rec for lemon flavored liquid for picky person