Can you touch the ball after reestablishing yourself?

Answer 1

What do you mean by "reestablishing your self" ... a batter can never touch a "live" ball ...

Answer:

If you are referring to a fielder that goes into the stands or dugout, then yes the player can come back in and establish himself on the field and play the ball. i.e if a player steps into a dugout on a pop-fly (generally ground rules state the 1st step is in play, but not the dugout) -- the player can come back onto the field of play and catch the ball --- this is the only scenario I can think of where your question applies to Baseball