Streaming from phone

Remember that Bluetooth is a lossy format -- like MP3. While lots of people are fine with Bluetooth, it does reduce sound quality. 

@peter_s is correct, you can set up a wireless network at the cottage without being connected to the internet. You will just need a streamer with Wi-Fi so that your phone can send lossless music to it across the network. 

Personally, I think the node sounds better than the WIIM. And it can be slowly upgraded, first by installing A linear, power supply module, and then ultimately by connecting it to an external DAC. and of course, more expensive options abound. Good luck!

Ok streamer with wifi seems to be a good option

Then I can use Tidal from my phone.

Any suggestions for good streamer with wifi?

The iPhone supports "bit perfect digital streaming". You need a USBC to USB-B (the one on the DAC).

So, this way the phone acts as the streamer and transmits to the cable directly. 

iPhone → Apple USB-C/Lightning to USB Camera Adapter → High-quality USB cable → External DAC

I’d start here. 

If you want you can use the cell phone to do the wifi and a streamer / DAC to receive. 

Be careful. You may need to use an Apple cable as second party USB cables do not support 24/192.

If you get a Bluesound, I’d recommend. you can try both ways and see which sounds better.