This is the way I do it. Here is my homemade instructions.
Step 1 - Find a 5 gallon bucket
Step 2 - Buy a 2ft section of PVC pipe
Step 3 - get 2 of these couplers 2" to 1 1/4"
Step 4 - Find a plastic fitting you can mount to the bottom side of your bucket that has an end that is 1 1/4 ID that you can mount to the coupler above and epoxy (or use marine GOO) to the bucket (you will need to drill a hole of course).
Step 5 - Stick a garden hose into your bucket and mount the system up to the boat-I have a DD so it was a straight shot. You may have to get creative with V-drive.