www.amazon.com

Promising review: "These are my favorite treats for my little guys, and they’re absolutely obsessed. There are so many ways to give them to your cats. Cut the top off and let them at it, drizzle it over their food, freeze it on a hot day, and let them lick it. My cat struggles with water intake, and often I will blend it into some water and give it to him like tuna juice. He laps the whole thing up. One whole tube of it is the perfect amount for my two cats." — Ains

Price: $6.41 for 20 packets (typically $10.69; available in eight flavors)

www.amazon.com

Note that certain features are added with the optional $6.99/month Furbo Cat Nanny subscription (slightly cheaper if you choose to be billed annually), including the real-time alerts and video history. Without the subscription, you can still check the live view, interact via two-way audio, play with them using the attached feather toy, and toss treats.