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that will 100% take care of the ants/bugs etc trying to get into my house.
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100%?...lol... no.
anykind of "home brew" stuff is about 99% old wives tales. i've seen people mix salt and sugar together and pour it all over their kitchen to "get rid of sugar ants" because "someone told them it killed them"...
killing an insect, any insect is relatively easy; a foot, hand, newspaper, even soapy water will kill any insect. the hard part begins when you want to keep everything out of the house with minimum amount of work.
in my state just about everything available to us on the commercial side is also available for private individuals to purchase, i dont know about your state but thats where you want to start. use the stuff that the professionals use, there is a reason they are professionals and there is a reason they use it. i cant tell you what to buy because you are in a completely different area of the country than i am and i dont know what insects you deal with or what is even allowed by your state, but i can help you with a starting point.
for an outside spray you need something with a long lasting residual so stay away from any kind of pyrethroid or any
FIFRA 25b product. look for something with the active ingredient
bifenthrin or
fipronil; those are the two most used down here.
make sure to follow the label!!!! do not think that "doubling up" will "do better" , in a lot of cases and can "do worse"