Regular concrete as a floor leveler?
Concrete is a terrible floor leveller, as it doesn't really bond well to anything other than itself, plus most commercial Quikcrete products have 3/8&quot; aggregate in it (won't work for a 1/4&quot; gap).
You don't need it anyhow: just use a good quality polymer modified tile mortar like Ceraflex 610 or Flextile 52 and install the tile.  You can easily use the mortar to float the tiles on a deeper or thinner bed.
If you can't get 50lbs of self leveller home without a vehicle, how will you get Quikcrete or mortar home?  It's all in 50lb bags.