Change the oil and filter. Restart the engine and check to see if there are any leaks. Shut down and check the oil level. Restart and let the engine come up to operating temp and check the hoses. No leaks or weepy fittings? Good. Then winterize the engine.
If you do this every year, you won't need sticky notes on your helm telling you that there is no oil in the engine. Sorry, but if you want to preserve the investment you have in your Wellcraft, you have to do these things properly, every year, no matter what. Not having a funnel isn't an excuse.
My response to your post isn't meant to be vindictive or nasty. Winterizing (as I write this it is 15 degrees here) is very important. Your Volvo engine and drive will only last as long as you take care of them.
Bill