Summertime also means bees, flies and beetles. And no one wants to have them in his bottle.
3d printing to the rescue.
Das Filament TPU (90 - 94A)
Schwarz / Black
I used TPU only once before, so I'll played it save. No retraction, no Infill (not needed) and I went slow... 20mm/s. Jip - that slow. But it worked out fine. Almost no stringing, perimeters are fine. and print time is okay.