Hi WantToKnowHim,
I found a verse in Philippians that might help you in the day dreaming department depending on what your day dreams are about...but this one helps me when I find my thoughts wondering from the things that our Lord would have me thinking about.
Philippians4:8-9 Finally, brethren, whatever things are true, whatever things are noble, whatever things are just, whatever things are pure, whatever things are lovely, whatever things are of good report, if there is any virtue and if there is anything praiseworthy--mediate on these things. The things which you learned and received and heard and saw in me, these do and the God of peace will be with you.
the gossiping is abit harder but I have found a few verses that may help you in this territory too. I know I too have a hard time with this one from time to time as we all who are human do.
Psalm19:14 Let the words of my mouth and the meditation of my heart be acceptable in Your sight, O Lord, my strength and my Redeemer.
When you find yourself in a situation where you are tempted to gossip if you want recite this bible verse silently to yourself as often as you need and in my case I also try to think of things that are good about the person or situation i'm tempted to talk about and more times that not I don't feel like gossping anymore but instead saying something nice about the person which you will find throws everyone for a loop...LOL! but, you might after all is said and done make a good impression on someone and they may decide to make a change in their lives in the decisions they make to talk about someone.
Oh, another thing that works is this...Asking God to put His hand over your mouth if something is not meant to be spoken from you..I've done this alot myself and God will help you control what you say and to whom you say it.
God bless and I will be praying for you.