How we save for equity as a couple and what we have changed so far

Hello everyone, my girlfriend and I are in our mid-20s and have set ourselves the goal of having equity for an apartment or a house together in five to six years. We now approach the whole thing almost like a project: cooking ahead on Sundays, taking a can to the office, shopping more consciously at Aldi and Lidl instead of spontaneously at Rewe, comparing and changing insurance policies via Check24. We get drugstore and household stuff via tiktok when product offers are on, which saves us around 15 to 20 euros