Barrel Manilow

Customizable Storage. A keg robot can hold up to five types of liquid payload totaling 10 flasks within its hollow, barrel-shaped body. A full keg robot can make one liquid attack per 2 flasks before the liquid must be refilled. Filling a keg robot takes 2 rounds per flask pair.

The lower section of the robot can contain 3 buckets worth of items/resources.

Magical Contraption
The construct is a magical creation with so many upgrades its attacks are considered magical.

The Keg Robot makes 2 attacks, either two punches, a punch and a Rocket Punch, or an Alchemist Fire Breath

Fist. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage.

Acid Squirt. Ranged Weapon Attack: +5 to hit, range 20/40 ft., one target. Hit: 7 (1d8 + 3) acid damage. (Required 2 vials of Acid to be installed in the storage) Each use uses 1/2 of a vial of acid.

Alchemist Fire Breath (Recharge 5–6). The robots head exhales fire in a 15-­-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 15 (4d6) fire damage on a failed save, or half as much damage on a successful one.
This action consumes 2 of the robots contained flasks worth of alchemists fire.

ROCKET PUNCH! (Recharge 4–6). The robots hand launches off at a nearby target +6 to hit (Range: 20/60). On hit the target takes (1d12 + 5 bludgeoning damage) and on a DC 15 Strength Saving throw fail, they are knocked prone, on a 1 they are knocked 10 ft away in a straight line from the attacker. The hand returns to their wrist after the attack is made.