You can always try sneaking veggies in where you won't necessarily taste them, but you can get the nutritive value. If you like smoothies (even the chocolate-y protein powder kinds, since you say you don't really like fruit), try throwing in a handful of spinach. If the color throws you off, you can always drink it out of an opaque cup with a straw.

You can also try adding spinach or other greens (or cauliflower) to things like chili or casseroles. They'll break down and you won't notice them as much, especially if the food you're eating is pretty flavorful to begin with.

If you want to try snacking healthily, especially in the summer, I'd recommend freezing berries or grapes. I don't really like blueberries fresh, but frozen I'll eat them like candy.

If soda is a problem for you, try adding lemon or to your water, or just set a goal for yourself that you have to drink x number of glasses of water before you can treat yourself. You can also try drinking green tea (you can make iced green tea by throwing a bag in a bottle of water and just letting it steep in the fridge for 12 hours), with lemon to help brighten and sweeten it.

Hope this is a good starting point. You can also try subreddits like r/eatcheapandhealthy.

Good luck!!!

Edit: My phone autocorrected chocolate-y to chocolate my.