Acid-spitting insect nether mobs

I want it so that in the nether there are these nests of insect-like mobs. I have not figured out a name for these mobs so I will just call them [blank]. The [blank] will spit acid at you and will be 1 block tall, 2 blocks wide, and 3 blocks long. The [blank] will have 7 hearts of health and will deal 2 hearts of damage. When they spit acid at you, the acid will last 5 seconds and will deal half as much damage per second as burning from lava. There will be 4-5 [blanks] that will spawn in the nest. The [ blanks] will be quite slow, they will be just as fast as a player riding a pig using a carrot on a stick. The [blanks] will spit at you every 4 seconds or so. The [blanks] will be hostile to any mob that goes near their nest. The [blanks] have a ram attack that will deal 1 heart of damage. Once you defeat the [blanks] you will be rewarded by a chest with random loot in it and also a pit of acid. If you have a bottle you can collect some of the acid, a pit of acid will be enough to fill 10 bottles. As you fill bottles with acid, the pit will empty out gradually. you can craft bottles with acid with arrows so that when you shoot a player they will be burnt and a 3x3 area where they are standing will be covered with temporary acid that will last for 10 seconds. [blanks] will only spawn in their nests and nests will be quite rare.