Installing an under-sink replaceable inline filter is a surprisingly easy DIY task if you want better tasting water. Parts are not expensive. Skip the thin white ones used for refrigerator/ice makers, and go the next size up.

Spend a little extra on a shut-off valve with a handle and install that first, just upstream of the new filter, to make changing filters easier (every 3-6 months, depends on water quality & volume). You will still have excellent water pressure at the sink, even if you use the newer thin and flexible 'push fit' tubes and couplings. I don't really have any plumbing experience and did not have any difficulty. Visit a professional plumbing supply business, explain what you are doing, and ask them to give you every single part you need. You may be pleasantly surprised at how simple it is. I think I spent the equivalent of about $80 for everything, including an upgraded valve and clear filter housing (to make visually inspecting the filter possible).

Don't forget the little bleed valve at the top of the filter container! After you turn the house water back on, it should hiss as the air escapes. When water dribbles out just hand tighten and you are done, no leaks.