Planning your trip well will ensure you have an enjoyable vacation. Remember you may not have access to a grocery store once you have set sail. It is recommended that you plan all your meals, breakfast, lunch, dinner and snacks, to be sure you will have everything.
Each houseboat rental company will provide different items on the boat. For example, some provide linens while others don't. Consult with the company you are renting from for their complete list. If you have any questions be sure to contact them, they will be more than happy to answer your questions.
The following link lists a number of suggested items to bring that you can print. It's not a full list but a good start.