The tequila you choose to infuse doesn't have to be high end or fancy. I go for mid range since we are going to be drinking it and nobody likes an icky spirit. Infusing doesn't make the tequila better just changes the flavor. Another note on buying tequila, if it doesn't say "100% agave" on the bottle, do not buy it. Unless life changing hangovers are your thing.
2 jalapenos, seeds and all, sliced width wise
1 bottle blanco tequila
Place jalapenos in large vessel and pour in tequila. Cover and allow to infuse for 24 hours. Taste test and decide if you can handle another 24 hours of infusing. The longer the jalapenos stay in the tequila, the spicier it will be.
Strain out jalapenos. I funneled mine into a new clean bottle (mostly because I can't get enough of those hinge stopper bottles) and labeled it.)
In my opinion, a maragaita is the best application for this tequila. Not all of us have bar measuring and shaking equipment at home so it you don't and are wondering how much 2 ounces of tequila is you can use tablespoons to measure. One tablespoon is 1/2 a fluid ounce.
2 oz jalapeno tequila
1/2 oz agave syrup
splash triple sec
juice of 1 lime (about 1.5 oz)
Mix together and serve over ice. Salt the glass rim if you like.