use creative mode to get lava and water OR BE EPIC AND GOOGLE HOW TO FIND LAVA AND WATER AND CAPTURE IT

dig a 4x1 hole ()()()() <- like this artistic diagram

then break another hole here:
()()(x)()

and place water here:
()()()(w)

and then lava here:
(L)()()()

complete diagram:
(lava)(cobblestone spawn)(2 deep hole)(water)

this person has the same method as they are intelligent like me at making cobblestone generators