Sippy cup

JK

My LO will be 6 months in about a week (where has the time gone ?!?) we plan to start introducing solids (BLW) then and I’m also planning to introduce the sippy cup soon. He is BF and since I’m a SAHM he rarely gets a bottle, like once every few weeks 🤷‍♀️. Should I pump and give him some BM in the sippy or just put a little water in there? If BM, do I replace a whole feeding or just put a little for practice?