then you need to buy the chilli, ginger, garlic, condiments, unless you cook Thai food without spices. If you cook for a family, yes it's cheaper to cook at home but for 1 person it is not unless you intend to eat the same dish over a few days. You cannot buy 50baht worth of ingredients and cook that 1 dish. I know because I do cook. For steaks and lamb, I cook at home because it's cheaper than eating out, but to cook pad krapow at home for just 1 meal? The ingredients list is more than 50baht even if you buy it from a wet market . There is no economy of scale.
if the 2 small burners are not enough for you, you can get a portable induction cooker relatively cheaply. I find a pressure cooker really useful and quick for 1 pot meals.
It can actually be cheaper eating out than cooking your own food unless you do not enjoy Thai street food. It's expensive cooking for 1 person because you need to get a list of ingredients just to cook 1 dish.
In the Midwest, you have to drive to get to a food joint. Over here, you only need to step out onto the street and you'll find a food cart or two, 7-11 round the corner with ready meals. And most are 30-60baht only.
Most apartments here provide a small kitchenette even for studios. My 1 bedroom even has a full sized oven.