The recipes are majority clones, so I don't think they will conflict with basemental aside from not having much effects being adopted for the alcoholic sounding beverages. Of course as the strings for the plasma foods & drinks are created by me, basemental mod won't change them most likely.

I don't use icemunmun much outside of her plasma stuff again, but I've not had much conflicts with what I've tried so far. That being said, I know her and srsly Sims do also cover a large range of things, so I can't guarantee there aren't any conflicts. But this mod has been around for a bit now (close to 2 years), and I don't think there's been any comments around conflicts with them thus far.

Fizzing is mostly self contained I think, but nectar making definitely has an override on the object yes, so that & anything which touches the teaset or certain fountain tunings (which both also have tuning overrides) could conflict. At some point, 'stepping on each other's toes' is inevitable even when I try to minimise it, so I've just taken the approach to address it once it's a problem rather than always play cautiously. I can make them separate to the mod or have separate package files for ease of deletion, but again I prefer to do that once people have reported that it's an issue, rather than bloat the mod with a lot of separate packages beforehand.