@Minholkin Just a tip from my vet:
Although fluids may be safely stored at room temperature, they may be too cold to be comfortable for a pet. Handle the bag, and place it against your bare arm. If the bag feels cool, consider warming it slightly before administration. Never microwave fluids that are meant to be injected. A good option is to hold the bag against your body for 20-30 minutes to bring the fluids up to your body temp. You can also place the bag in warm h2O or heating pad on low.