Yes
To add your bottle to multiple devices you would need to download the app, sign in on the other devices with the exact same email you used to set up the original account and be sure you have Bluetooth turned on. It will connect automatically since the bottle is paired to an account rather than a device.
Please note, only one device can be connected to the bottle at a time, so it will only show connected to the app you have open on the device you are using. To connect to another device, completely close the HidrateSpark App "Swipe it off the screen" as backgrounding it will still keep the connection, or turn off bluetooth on the device you do not want it paired to. Then restart the HidrateSpark App on the desired device you would like it to be connected to and it should connect.