Coffee is the answer

coffee is the answer is an esolang created for this with 3 commands.

commands

create() - creates a string
x.attach(y) - adds y prefixed with a space to x, unless it is the first then there is no prefixed space
console() - outputs a string

example

create(string)
string.attach("what")
string.attach("is")
string.attach("the")
string.attach("best")
string.attach("liquid")
console(string)