On Mon, 20 May 2019 05:21:53 -0700 (PDT), AK
wrote:

I want to get a bottle holder for my bike.
It has no pre-drilled holes for the holder.

Any manner of cage mount. Attach to bicycle frame using Ty-wraps. Be
sure to put some tape, foam, or plastic between the cage mount and the
bicycle tube to avoid scratching the paint. If the Ty-wraps seem
loose, replace with a thicker and heavier Ty-wrap. Do not use hose
clamps as you're likely to cut yourself on the exposed metal strap.

There are also water bottle mounting clamps designed for the purpose:
https://www.ebay.com/sch/i.html?_nkw=bicycle+water+bottle+clamp

Drilling holes in the frame will not brand you an infidel. Instead,
you will be labeled a heretic for not following the wisdom of the
bicycling orthodoxy.
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558