No. Many families create their own curriculum. Since your curriculum is your plan of study, you can pull from various sources, including life experiences, that you find valuable to your homeschooling experience. There are no state regulations that require you to purchase a curriculum or to have it approved by anyone other than you, the administrator of your homeschool.
WHPA provides information about homeschooling in Wisconsin. WHPA does not provide specific legal advice to any specific individuals in the context of any specific matters. It is the responsibility of each homeschool administrator/parent or guardian to read original source material and make decisions on compliance for themselves. When you file the PI-1206 Homeschool Report with the Wisconsin Department of Public Instruction, you take full responsibility for understanding and complying with the laws outlined on that form. WHPA does not endorse or provide curriculum suggestions or specific materials for any particular educational approach.