Reddit reviews KINGSO Kids Adults Safe Swimming Kickboard Pool Training Aid Float Hand Board Tool Foam

The hard part will be to get a decently executed technique (probably aiming for front crawl) from training alone. And it's the technique you'll need first.
Maybe you can bring a device (tablet in a clear waterproof bag, e.g. ziploc bag) to watch videos and immediately execute what you saw/learned. Watching home and trying later makes it hard.
Also: Ask you pool supervisor if you can borrow a Pull Buoy and a Kickboard. With these you learn leg/arm motion better because you train them separately and can concentrate on one thing at a time.
Once you achieved a decent technique, you can aim for performance.