ᐅ How much water does a concrete slab contractor typically require?

Unfortunately, we are having serious difficulties obtaining construction water. For reasons unknown to us, the contact person responsible for us at the relevant association made commitments three times for a specific calendar week but failed to fulfill any of them. Each time, only after we followed up, a new promise was made—which, like the previous ones, was not kept. As a result, it seems we will no longer receive construction water from the association and are now looking into renting a water trailer for transport. (We can’t risk upsetting the “water worker” by asking again, since he will be responsible for inspecting our house at the end and could delay our move-in by months or even years if he chooses to.)

--> Does anyone know approximately how much water a concrete slab installer might need? And yes, we’ve already asked the installer but have not yet received any information. The concrete slab is about 10 x 10 m (33 x 33 ft).

Thanks in advance to all of you. Often, I don’t know what I would do without your valuable tips, advice, and suggestions.