Paying for shipping is far less than paying for being treated for giardia. Did you "google" the area you are going to and giardia? If there has been testing it should be public information.

I use chlorine tabs. They really last quite a while. You only have to purify your drinking water. Cook water boils anyway so it does not have to be treated.

My sawyer squeeze broke after about a year's use. So I have given up on filters. Back to the chemicals. Lucikly much of the area I backpack is very high altitude with pure water so I just take the chance. But I always take chlorine tabs as a back up.