There are so many goods you don't realize contain dairy. I mean, sure, you know yogurt is dairy, but you probably never thought about it that much. Ranch dressing, chocolate, batter…dairy stomping grounds. Even items like sour cream and onion-flavored chips contain dairy! Completely avoiding it in my diet has been ridiculously difficult, but I've managed by substituting dairy products with non-dairy options. I'm not a fan of almond milk, so I opted for coconut milk instead, which is delicious and I highly recommend it. The fat content is a bit higher than other nut milks, but there are light options if that's a concern. Coconut milk is not for you, by the way, if you hate the taste of coconut. It doesn't taste like a piña colada or anything, but it does have a distinct flavor.
Whether you choose coconut, almond, soy, or some other dairy alternative, make sure you check the ingredients for carrageenan. These are polysaccharides extracted from seaweed, and are used in the food industry for stability and thickening. They're found in a lot of products, but are extremely common in dairy alternatives. There is still a ton of research surrounding the effects of carrageenan, but there are many reports of it increasing inflammation and causing gastro-intestinal issues. Totes up to you if you want to avoid it or not, but I was originally drinking Silk and my stomach did not agree. I've been fine ever since switching to a pure coconut milk, and I put it in coffee, cereal, smoothies, and more.
I also swapped in coconut Greek yogurt and coconut milk ice cream. I substituted in clarified butter—or ghee—for regular butter. Everything tasted about the same as products with dairy. There are tons of non-dairy options out there, but they are not all created equally. There are even dairy-free cheeses, but they are honestly offensive to cheese. If you're thinking about going dairy-free, it's going to take some trial and error before you find substitutes you love. Dairy substitutes taste a little different and cook differently as well. There's no substitute that will work for everyone, so try alternatives until you figure out what your body likes.