drinking while breastfeeding

i just need some quick help i breast feed & today im going to have a break from the LO. ( i pumped enough milk for a whole 2 days just incase ) & i was just wondering how much can i drink & when will it be out of my system ? i bought breastmilk testing strips but i want to test them around a certain time frame just so i wont waste a bunch. hope this makes sense im a ftm & finally getting time to myself after 4 months please go easy on me.