You can get a 100-150aH AGM battery for not too much money online, check Amazon and eBay…and if you’re not running a fridge or AC I’d imagine one of those would be sufficient for your needs. Gonna take a while to charge one back up though off a 60w panel as the other commenter mentions they use. I’d have at least one 100watt panel, if not two or three, if I were you. Just my personal perspective mind you. Still manageable w a 60w panel but it’ll take a while like I mentioned. Also depends on the season, the weather, and where you’re gonna be boondocking of course.

I use 4x 100watt Renogy panels right now, and I used to have two 125aH AGM before switching to a single 150aH Lithium battery. (I full time and run my fridge on propane btw)

These are decent batteries here:

12V 100AH SLA Battery https://www.amazon.com/dp/B00S1QCK94/ref=cm_sw_r_cp_api_i_F6N9GFJEBHEJJJD2ZCXB

Before I switched to lithium, I ran two of these exact models here (used to be cheaper than they are now sadly):

Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery for Use with Pv Solar Panels Smart chargers, Wind Turbines and Inverters and Backup Power (12 Volt 125Ah Group 31 AGM) https://www.amazon.com/dp/B00ACNO2AO/ref=cm_sw_r_cp_api_i_Q1QW2MX5CXJ2EH0GWTNR?_encoding=UTF8&psc=1