I think the tomato planted upside down grows up to the light. Saw how cucumber was planted in a bottle and the bottle partly in the earth.
What I find tricky is how to pull the plant through the opening of the bottle.

You cut the 1-2 litres bottles horizontal?

If I see all those videos about what people do with plastic bottles it's hard to believe there's so much trash.

I noticed too rain water does plants good even if it looks as if it's too much.