I know this has been done before (see Volcanic Picnic Plates by hpstoutharrow in outside: camping). I have to give him credit for giving me the incentive to put his idea on steroids (like Arnold S.) I just needed more room on my plate for more goodies! So here goes!
Step 1: Get a rally big plate!
I wanted more space on my plate for more food. I found out too many times at family picnics that if you don't get it the first time around, its gone! So enter the Picnic Plate on Steroids! I found a really big plate (platter) at my local and favorite Dollar Store, also some good size drink bottles.
Now trace the bottle mouth (top cap removed) ,underneath the plate in the center. I used a felt tip marker. Get out your trusty Dremel Tool fitted with a composite cutting wheel, (please: wear gloves & eye protection ) and carefully cut out the circle that you have just traced. Cut inside the line for a good fit. You can always remove more plastic for a nice fit but you can't put it back! It does not have to be perfect, as long as the bottle threads fit through the hole and the cap screws onto the bottle from above with the plate in between.
Step 2: Soldering Gun can be used too!
If you don't have a Dremel Tool (get one, they are awesome) you can use a Soldering Gun to melt the hole, then clean up the edges with sandpaper. Place a fan to blow air across your work area. So you won't breath the fumes. Plastic melting is stinky and toxic. Don't breathe it!!!
Step 3: Fit your bottle up into the plate!
Place your bottle up under the plate and see how it fits. Don't worry if its a little loose. Now screw on the cap and snug it down. If it fits nice, you have done it! If not make adjustments to the hole and fit again.
Step 4: Wash then Fill with drink & screw on the cap!
Wash out :Use warm soapy water, rinse well, then fill with your favorite drink! Screw on the cap.