I thun it would be too late now to be thinking of this if you haven't bought Bitcoins already. But hey, anything free is great right? So if you already did buy or still wanting to buy bitcoins, then there are two things you can actually do.
First is getting yourself an offline wallet that supports the upcoming fork and place your hard earned or bought bitcoins there.
Second is to transfer your bitcoins on online exchanges that are also supporting the upcoming fork.

That's pretty much it. I hope this helps, good luck.