No, you can not use it in addition As it is not a light weapon, you can not attack with any other weapon in that turn unless you have the Dual Wielder feat.
Do archers get attacks of opportunity?
If you only have a ranged weapon, you can’t make an opportunity attack, besides an unarmed or improvised weapon attack (smacking them with your bow.) And yes, if you have Warcaster, you would be casting an Attack Spell with disadvantage unless you also have the Crossbow Expert feat.
What should I use as a weapon of opportunity?
Items like a baseball bat, fire poker, or shovel work great for that. At close range, items like a pen or pair of scissors will allow you to hold them close and attack their weapon hand and primary areas (like eyes, neck, and groin) more effectively. If you are facing a firearm and you are unable to escape]
When do you need to use improvised weapons?
Improvised weapon skills can come in handy whenever you are in a place or country where weapons are outright banned or extremely tightly controlled. You need not go through the hassle of even attempting to bring your weapons with you or procure traditional weapons on site.
Where do improvised weapons have a huge advantage over conventional weapons?
Where improvised weapons have a huge advantage over conventional weapons is that they are completely innocuous prior to assembly or extremely difficult to mark as weapon, depending. Improvised weapon skills can come in handy whenever you are in a place or country where weapons are outright banned or extremely tightly controlled.
Is there specific that overrides the general improvised weapon 20 / 60 rules?
So STR to hit (or Dex if the GM would like as it is a Ranged attack. Seemingly it could be either due to the two rule sets). Then D4+STR on impact + whatever the flask itself does. The acid entry says 20ft. Is that a specific that overrides the general Improvised weapon 20/60 rules?