fluid 
A fluid can be used to specify any minecraft liquid.
Note
The fluid command can be used to get a list of registered fluid names.
Argument
A fluid is specified using the “fluid” keyword.
fluid(name)
Example
#creates a fluid of type water
fluid(water)Modifiers
Count
Specifies the amount of the fluid in mb, by default this is 1000.
.count(amount)
.c(amount)
Meta
Specifies the metadata value assigned to the fluid.
.meta(value)
.m(value)
NBT
Specifies any NBT information assigned to the fluid.
.nbt(value)
.n(value)