>>1127789For $20, you can't go wrong with a Topeak Hexus II. It's my take everywhere with me bike multi tool. My Hexus has seen me cycle through 3 different bikes and it's still my general purpose bike tool. No doubt others can vouch for the tool. There's better tools out there but the price to durability of this thing is solid.
Now chain lube is controversial here and you just opened a can of worms... but I believe in brush chain without degreasing, wipe grime, apply 80w-90 gear oil, then wipe excess. It gets black and greasy quick but it's cheap and it works.