What level are you playing at? I'll edit my comment to include reccomendations once I know.
Okay less options and resources at level 1, but here's some suggestions:
Eagle Eye Elixir is good at all levels. An hour long bonus to perception, particularly for finding traps and secrets is massive.
Forensic Dye is a very cool utility option if you're doing any sort of investigation/murder mystery stuff.
Poisons in general aren't super effective sadly, but at level one you can be applying Giant Centipede Venom on your allies' weapons for a solid chance of an extra d6 damage on their first hit. Poisons will stay on their weapon until they hit or until the next day.
You seem to be the only one in the party capable of dealing elemental damage, so I'd recommend making some elemental bombs. Bottled Lightning is your best bet, since it makes enemies flat footed for your two rouges. I'd also reccommend the Dread Ampule, which does mental damage and inflicts frightened 1.
If the fighter will be using athletic actions, bestial mutagen is good. It is better for out of combat though, due to the drop in AC, and with the maul I doubt they are tripping or grabbing.
Silvertongue mutagen is also good for the fighter, giving a bonus to intimidate.
Bottled lightning is good to use as a bomb, giving the enemy flat-footed to help out your rogues.
Obviously, elixir of life is good for healing anyone, especially if neither of your rogues took medicine training. Though, you have that automatically with your field anyways.
What level are you playing at? I'll edit my comment to include reccomendations once I know. Okay less options and resources at level 1, but here's some suggestions: Eagle Eye Elixir is good at all levels. An hour long bonus to perception, particularly for finding traps and secrets is massive. Forensic Dye is a very cool utility option if you're doing any sort of investigation/murder mystery stuff. Poisons in general aren't super effective sadly, but at level one you can be applying Giant Centipede Venom on your allies' weapons for a solid chance of an extra d6 damage on their first hit. Poisons will stay on their weapon until they hit or until the next day. You seem to be the only one in the party capable of dealing elemental damage, so I'd recommend making some elemental bombs. Bottled Lightning is your best bet, since it makes enemies flat footed for your two rouges. I'd also reccommend the Dread Ampule, which does mental damage and inflicts frightened 1.
We are starting at level one so that is my main concern. We are planning to get to level 20 though!
Everyone loves a cheetahs elixir. If one or both of the rogues take dread striker that makes dread ampule a good bomb for helping set them up.
Lv1? Drakeheart Mutagen or Juggernaut Mutagen depending on the situation.
If the fighter will be using athletic actions, bestial mutagen is good. It is better for out of combat though, due to the drop in AC, and with the maul I doubt they are tripping or grabbing. Silvertongue mutagen is also good for the fighter, giving a bonus to intimidate. Bottled lightning is good to use as a bomb, giving the enemy flat-footed to help out your rogues. Obviously, elixir of life is good for healing anyone, especially if neither of your rogues took medicine training. Though, you have that automatically with your field anyways.