What is produced in the equation #Li_2O(s) + H_2O(l) -> 2LiOH(aq)#?
Do you mean apart from heat?
You have a balanced chemical equation, which properly represents the reaction of the oxide with water to form 2 equiv of lithium hydroxide. Of course, this reaction will produce a little bit of heat,
I am not sure if I understand the question correctly, but if you are asking what is the product of a reaction between Li2O and water.. then the answer is Lithium Hydroxide - LiOH