What's a good water bottle to use that has a filter built in?

I'll be traveling to Central America this summer; more specifically, Belize. Belize is a developing country so the tap water there is not safe to drink. Doctors have told me to only drink bottled water when I'm there. However, I do not know where in Belize I will be staying just yet, and bottled water is not available everywhere in the country. So, I am looking for a water bottle that has a filter built into it and is also reasonably priced. Most water bottles like this that I'm coming across only filter out chlorine, odor, and bad taste. I need one that will filter it completely and make it safe to drink. Any recommendations?