I've done the travel size squeeze bottle, but usually I put my water in a custard cup and snuffle it instead of pouring it. A zillion years ago, when dinos roamed the earth, Shirley Mclaine talked about snuffling salt water from a tea cup in the shower every morning, so I decided to give it a go. Neti pot is probably easier, but they kinda creep me out and I'm used to the snuffling.

And yeah, yikes, amoeba. I always use filtered water, but now I'm switching to boiled, filtered water. 0_0